


Config(3p)       Perl Programmers Reference Guide      Config(3p)


NAME
       Config - access Perl configuration information

SYNOPSIS
           use Config;
           if ($Config{usethreads}) {
               print "has thread support\n"
           }

           use Config qw(myconfig config_sh config_vars config_re);

           print myconfig();

           print config_sh();

           print config_re();

           config_vars(qw(osname archname));

DESCRIPTION
       The Config module contains all the information that was
       available to the "Configure" program at Perl build time
       (over 900 values).

       Shell variables from the config.sh file (written by
       Configure) are stored in the readonly-variable %Config,
       indexed by their names.

       Values stored in config.sh as 'undef' are returned as
       undefined values.  The perl "exists" function can be used
       to check if a named variable exists.

       For a description of the variables, please have a look at
       the Glossary file, as written in the Porting folder, or
       use the url:
       http://perl5.git.perl.org/perl.git/blob/HEAD:/Porting/Glossary

       myconfig()
           Returns a textual summary of the major perl
           configuration values.  See also "-V" in "Switches" in
           perlrun.

       config_sh()
           Returns the entire perl configuration information in
           the form of the original config.sh shell variable
           assignment script.

       config_re($regex)
           Like config_sh() but returns, as a list, only the
           config entries who's names match the $regex.

       config_vars(@names)
           Prints to STDOUT the values of the named configuration
           variable. Each is printed on a separate line in the



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           form:

             name='value';

           Names which are unknown are output as
           "name='UNKNOWN';".  See also "-V:name" in "Switches"
           in perlrun.

EXAMPLE
       Here's a more sophisticated example of using %Config:

           use Config;
           use strict;

           my %sig_num;
           my @sig_name;
           unless($Config{sig_name} && $Config{sig_num}) {
               die "No sigs?";
           } else {
               my @names = split ' ', $Config{sig_name};
               @sig_num{@names} = split ' ', $Config{sig_num};
               foreach (@names) {
                   $sig_name[$sig_num{$_}] ||= $_;
               }
           }

           print "signal #17 = $sig_name[17]\n";
           if ($sig_num{ALRM}) {
               print "SIGALRM is $sig_num{ALRM}\n";
           }

WARNING
       Because this information is not stored within the perl
       executable itself it is possible (but unlikely) that the
       information does not relate to the actual perl binary
       which is being used to access it.

       The Config module is installed into the architecture and
       version specific library directory
       ($Config{installarchlib}) and it checks the perl version
       number when loaded.

       The values stored in config.sh may be either single-quoted
       or double-quoted. Double-quoted strings are handy for
       those cases where you need to include escape sequences in
       the strings. To avoid runtime variable interpolation, any
       "$" and "@" characters are replaced by "\$" and "\@",
       respectively. This isn't foolproof, of course, so don't
       embed "\$" or "\@" in double-quoted strings unless you're
       willing to deal with the consequences. (The slashes will
       end up escaped and the "$" or "@" will trigger variable
       interpolation)





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GLOSSARY
       Most "Config" variables are determined by the "Configure"
       script on platforms supported by it (which is most UNIX
       platforms).  Some platforms have custom-made "Config"
       variables, and may thus not have some of the variables
       described below, or may have extraneous variables specific
       to that particular port.  See the port specific
       documentation in such cases.

   _
       "_a"
           From Unix.U:

           This variable defines the extension used for ordinary
           library files.  For unix, it is .a.  The . is
           included.  Other possible values include .lib.

       "_exe"
           From Unix.U:

           This variable defines the extension used for
           executable files.  "DJGPP", Cygwin and OS/2 use .exe.
           Stratus "VOS" uses .pm.  On operating systems which do
           not require a specific extension for executable files,
           this variable is empty.

       "_o"
           From Unix.U:

           This variable defines the extension used for object
           files.  For unix, it is .o.  The . is included.  Other
           possible values include .obj.

   a
       "afs"
           From afs.U:

           This variable is set to "true" if "AFS" (Andrew File
           System) is used on the system, "false" otherwise.  It
           is possible to override this with a hint value or
           command line option, but you'd better know what you
           are doing.

       "afsroot"
           From afs.U:

           This variable is by default set to /afs. In the
           unlikely case this is not the correct root, it is
           possible to override this with a hint value or command
           line option.  This will be used in subsequent tests
           for AFSness in the configure and test process.

       "alignbytes"
           From alignbytes.U:



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           This variable holds the number of bytes required to
           align a double-- or a long double when applicable.
           Usual values are 2, 4 and 8.  The default is eight,
           for safety.

       "ansi2knr"
           From ansi2knr.U:

           This variable is set if the user needs to run
           ansi2knr.  Currently, this is not supported, so we
           just abort.

       "aphostname"
           From d_gethname.U:

           This variable contains the command which can be used
           to compute the host name. The command is fully
           qualified by its absolute path, to make it safe when
           used by a process with super-user privileges.

       "api_revision"
           From patchlevel.U:

           The three variables, api_revision, api_version, and
           api_subversion, specify the version of the oldest perl
           binary compatible with the present perl.  In a full
           version string such as 5.6.1, api_revision is the 5.
           Prior to 5.5.640, the format was a floating point
           number, like 5.00563.

           perl.c:incpush() and lib/lib.pm will automatically
           search in $sitelib/.. for older directories back to
           the limit specified by these api_ variables.  This is
           only useful if you have a perl library directory tree
           structured like the default one.  See "INSTALL" for
           how this works.  The versioned site_perl directory was
           introduced in 5.005, so that is the lowest possible
           value.  The version list appropriate for the current
           system is determined in inc_version_list.U.

           "XXX" To do:  Since compatibility can depend on
           compile time options (such as bincompat, longlong,
           etc.) it should (perhaps) be set by Configure, but
           currently it isn't.  Currently, we read a hard-wired
           value from patchlevel.h.  Perhaps what we ought to do
           is take the hard-wired value from patchlevel.h but
           then modify it if the current Configure options
           warrant.  patchlevel.h then would use an #ifdef guard.

       "api_subversion"
           From patchlevel.U:

           The three variables, api_revision, api_version, and
           api_subversion, specify the version of the oldest perl



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           binary compatible with the present perl.  In a full
           version string such as 5.6.1, api_subversion is the 1.
           See api_revision for full details.

       "api_version"
           From patchlevel.U:

           The three variables, api_revision, api_version, and
           api_subversion, specify the version of the oldest perl
           binary compatible with the present perl.  In a full
           version string such as 5.6.1, api_version is the 6.
           See api_revision for full details.  As a special case,
           5.5.0 is rendered in the old-style as 5.005.  (In the
           5.005_0x maintenance series, this was the only
           versioned directory in $sitelib.)

       "api_versionstring"
           From patchlevel.U:

           This variable combines api_revision, api_version, and
           api_subversion in a format such as 5.6.1 (or 5_6_1)
           suitable for use as a directory name.  This is
           filesystem dependent.

       "ar"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the ar
           program.  After Configure runs, the value is reset to
           a plain "ar" and is not useful.

       "archlib"
           From archlib.U:

           This variable holds the name of the directory in which
           the user wants to put architecture-dependent public
           library files for $package.  It is most often a local
           directory such as /usr/local/lib.  Programs using this
           variable must be prepared to deal with filename
           expansion.

       "archlibexp"
           From archlib.U:

           This variable is the same as the archlib variable, but
           is filename expanded at configuration time, for
           convenient use.

       "archname"
           From archname.U:

           This variable is a short name to characterize the
           current architecture.  It is used mainly to construct



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           the default archlib.

       "archname64"
           From use64bits.U:

           This variable is used for the 64-bitness part of
           $archname.

       "archobjs"
           From Unix.U:

           This variable defines any additional objects that must
           be linked in with the program on this architecture.
           On unix, it is usually empty.  It is typically used to
           include emulations of unix calls or other facilities.
           For perl on OS/2, for example, this would include
           os2/os2.obj.

       "asctime_r_proto"
           From d_asctime_r.U:

           This variable encodes the prototype of asctime_r.  It
           is zero if d_asctime_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_asctime_r is defined.

       "awk"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the awk
           program.  After Configure runs, the value is reset to
           a plain "awk" and is not useful.

   b
       "baserev"
           From baserev.U:

           The base revision level of this package, from the
           .package file.

       "bash"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "bin"
           From bin.U:

           This variable holds the name of the directory in which
           the user wants to put publicly executable images for
           the package in question.  It is most often a local
           directory such as /usr/local/bin. Programs using this



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           variable must be prepared to deal with ~name
           substitution.

       "binexp"
           From bin.U:

           This is the same as the bin variable, but is filename
           expanded at configuration time, for use in your
           makefiles.

       "bison"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the bison
           program.  After Configure runs, the value is reset to
           a plain "bison" and is not useful.

       "byacc"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the byacc
           program.  After Configure runs, the value is reset to
           a plain "byacc" and is not useful.

       "byteorder"
           From byteorder.U:

           This variable holds the byte order in a "UV". In the
           following, larger digits indicate more significance.
           The variable byteorder is either 4321 on a big-endian
           machine, or 1234 on a little-endian, or 87654321 on a
           Cray ... or 3412 with weird order !

   c
       "c" From n.U:

           This variable contains the \c string if that is what
           causes the echo command to suppress newline.
           Otherwise it is null.  Correct usage is $echo $n
           "prompt for a question: $c".

       "castflags"
           From d_castneg.U:

           This variable contains a flag that precise
           difficulties the compiler has casting odd floating
           values to unsigned long: 0 = ok 1 = couldn't cast < 0
           2 = couldn't cast >= 0x80000000 4 = couldn't cast in
           argument expression list

       "cat"
           From Loc.U:



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           This variable is used internally by Configure to
           determine the full pathname (if any) of the cat
           program.  After Configure runs, the value is reset to
           a plain "cat" and is not useful.

       "cc"
           From cc.U:

           This variable holds the name of a command to execute a
           C compiler which can resolve multiple global
           references that happen to have the same name.  Usual
           values are "cc" and "gcc".  Fervent "ANSI" compilers
           may be called "c89".  "AIX" has xlc.

       "cccdlflags"
           From dlsrc.U:

           This variable contains any special flags that might
           need to be passed with "cc -c" to compile modules to
           be used to create a shared library that will be used
           for dynamic loading.  For hpux, this should be +z.  It
           is up to the makefile to use it.

       "ccdlflags"
           From dlsrc.U:

           This variable contains any special flags that might
           need to be passed to cc to link with a shared library
           for dynamic loading.  It is up to the makefile to use
           it.  For sunos 4.1, it should be empty.

       "ccflags"
           From ccflags.U:

           This variable contains any additional C compiler flags
           desired by the user.  It is up to the Makefile to use
           this.

       "ccflags_uselargefiles"
           From uselfs.U:

           This variable contains the compiler flags needed by
           large file builds and added to ccflags by hints files.

       "ccname"
           From Checkcc.U:

           This can set either by hints files or by Configure.
           If using gcc, this is gcc, and if not, usually equal
           to cc, unimpressive, no?  Some platforms, however,
           make good use of this by storing the flavor of the C
           compiler being used here.  For example if using the
           Sun WorkShop suite, ccname will be "workshop".




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       "ccsymbols"
           From Cppsym.U:

           The variable contains the symbols defined by the C
           compiler alone.  The symbols defined by cpp or by cc
           when it calls cpp are not in this list, see cppsymbols
           and cppccsymbols.  The list is a space-separated list
           of symbol=value tokens.

       "ccversion"
           From Checkcc.U:

           This can set either by hints files or by Configure.
           If using a (non-gcc) vendor cc, this variable may
           contain a version for the compiler.

       "cf_by"
           From cf_who.U:

           Login name of the person who ran the Configure script
           and answered the questions. This is used to tag both
           config.sh and config_h.SH.

       "cf_email"
           From cf_email.U:

           Electronic mail address of the person who ran
           Configure. This can be used by units that require the
           user's e-mail, like MailList.U.

       "cf_time"
           From cf_who.U:

           Holds the output of the "date" command when the
           configuration file was produced. This is used to tag
           both config.sh and config_h.SH.

       "chgrp"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "chmod"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the chmod
           program.  After Configure runs, the value is reset to
           a plain "chmod" and is not useful.

       "chown"
           From Loc.U:




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           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "clocktype"
           From d_times.U:

           This variable holds the type returned by times(). It
           can be long, or clock_t on "BSD" sites (in which case
           <sys/types.h> should be included).

       "comm"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the comm
           program.  After Configure runs, the value is reset to
           a plain "comm" and is not useful.

       "compress"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "contains"
           From contains.U:

           This variable holds the command to do a grep with a
           proper return status.  On most sane systems it is
           simply "grep".  On insane systems it is a grep
           followed by a cat followed by a test.  This variable
           is primarily for the use of other Configure units.

       "cp"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the cp
           program.  After Configure runs, the value is reset to
           a plain "cp" and is not useful.

       "cpio"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "cpp"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the cpp
           program.  After Configure runs, the value is reset to
           a plain "cpp" and is not useful.



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       "cpp_stuff"
           From cpp_stuff.U:

           This variable contains an identification of the
           concatenation mechanism used by the C preprocessor.

       "cppccsymbols"
           From Cppsym.U:

           The variable contains the symbols defined by the C
           compiler when it calls cpp.  The symbols defined by
           the cc alone or cpp alone are not in this list, see
           ccsymbols and cppsymbols.  The list is a space-
           separated list of symbol=value tokens.

       "cppflags"
           From ccflags.U:

           This variable holds the flags that will be passed to
           the C pre- processor. It is up to the Makefile to use
           it.

       "cpplast"
           From cppstdin.U:

           This variable has the same functionality as cppminus,
           only it applies to cpprun and not cppstdin.

       "cppminus"
           From cppstdin.U:

           This variable contains the second part of the string
           which will invoke the C preprocessor on the standard
           input and produce to standard output.  This variable
           will have the value "-" if cppstdin needs a minus to
           specify standard input, otherwise the value is "".

       "cpprun"
           From cppstdin.U:

           This variable contains the command which will invoke a
           C preprocessor on standard input and put the output to
           stdout. It is guaranteed not to be a wrapper and may
           be a null string if no preprocessor can be made
           directly available. This preprocessor might be
           different from the one used by the C compiler. Don't
           forget to append cpplast after the preprocessor
           options.

       "cppstdin"
           From cppstdin.U:

           This variable contains the command which will invoke
           the C preprocessor on standard input and put the



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           output to stdout.  It is primarily used by other
           Configure units that ask about preprocessor symbols.

       "cppsymbols"
           From Cppsym.U:

           The variable contains the symbols defined by the C
           preprocessor alone.  The symbols defined by cc or by
           cc when it calls cpp are not in this list, see
           ccsymbols and cppccsymbols.  The list is a space-
           separated list of symbol=value tokens.

       "crypt_r_proto"
           From d_crypt_r.U:

           This variable encodes the prototype of crypt_r.  It is
           zero if d_crypt_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_crypt_r is defined.

       "cryptlib"
           From d_crypt.U:

           This variable holds -lcrypt or the path to a
           libcrypt.a archive if the crypt() function is not
           defined in the standard C library. It is up to the
           Makefile to use this.

       "csh"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the csh
           program.  After Configure runs, the value is reset to
           a plain "csh" and is not useful.

       "ctermid_r_proto"
           From d_ctermid_r.U:

           This variable encodes the prototype of ctermid_r.  It
           is zero if d_ctermid_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_ctermid_r is defined.

       "ctime_r_proto"
           From d_ctime_r.U:

           This variable encodes the prototype of ctime_r.  It is
           zero if d_ctime_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_ctime_r is defined.

   d




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       "d__fwalk"
           From d__fwalk.U:

           This variable conditionally defines "HAS__FWALK" if
           _fwalk() is available to apply a function to all the
           file handles.

       "d_access"
           From d_access.U:

           This variable conditionally defines "HAS_ACCESS" if
           the access() system call is available to check for
           access permissions using real IDs.

       "d_accessx"
           From d_accessx.U:

           This variable conditionally defines the "HAS_ACCESSX"
           symbol, which indicates to the C program that the
           accessx() routine is available.

       "d_aintl"
           From d_aintl.U:

           This variable conditionally defines the "HAS_AINTL"
           symbol, which indicates to the C program that the
           aintl() routine is available.  If copysignl is also
           present we can emulate modfl.

       "d_alarm"
           From d_alarm.U:

           This variable conditionally defines the "HAS_ALARM"
           symbol, which indicates to the C program that the
           alarm() routine is available.

       "d_archlib"
           From archlib.U:

           This variable conditionally defines "ARCHLIB" to hold
           the pathname of architecture-dependent library files
           for $package.  If $archlib is the same as $privlib,
           then this is set to undef.

       "d_asctime64"
           From d_timefuncs64.U:

           This variable conditionally defines the HAS_ASCTIME64
           symbol, which indicates to the C program that the
           asctime64 () routine is available.

       "d_asctime_r"
           From d_asctime_r.U:




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           This variable conditionally defines the
           "HAS_ASCTIME_R" symbol, which indicates to the C
           program that the asctime_r() routine is available.

       "d_atolf"
           From atolf.U:

           This variable conditionally defines the "HAS_ATOLF"
           symbol, which indicates to the C program that the
           atolf() routine is available.

       "d_atoll"
           From atoll.U:

           This variable conditionally defines the "HAS_ATOLL"
           symbol, which indicates to the C program that the
           atoll() routine is available.

       "d_attribute_deprecated"
           From d_attribut.U:

           This variable conditionally defines
           "HASATTRIBUTE_DEPRECATED", which indicates that "GCC"
           can handle the attribute for marking deprecated APIs

       "d_attribute_format"
           From d_attribut.U:

           This variable conditionally defines
           "HASATTRIBUTE_FORMAT", which indicates the C compiler
           can check for printf-like formats.

       "d_attribute_malloc"
           From d_attribut.U:

           This variable conditionally defines
           "HASATTRIBUTE_MALLOC", which indicates the C compiler
           can understand functions as having malloc-like
           semantics.

       "d_attribute_nonnull"
           From d_attribut.U:

           This variable conditionally defines
           "HASATTRIBUTE_NONNULL", which indicates that the C
           compiler can know that certain arguments must not be
           "NULL", and will check accordingly at compile time.

       "d_attribute_noreturn"
           From d_attribut.U:

           This variable conditionally defines
           "HASATTRIBUTE_NORETURN", which indicates that the C
           compiler can know that certain functions are



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           guaranteed never to return.

       "d_attribute_pure"
           From d_attribut.U:

           This variable conditionally defines
           "HASATTRIBUTE_PURE", which indicates that the C
           compiler can know that certain functions are "pure"
           functions, meaning that they have no side effects, and
           only rely on function input and/or global data for
           their results.

       "d_attribute_unused"
           From d_attribut.U:

           This variable conditionally defines
           "HASATTRIBUTE_UNUSED", which indicates that the C
           compiler can know that certain variables and arguments
           may not always be used, and to not throw warnings if
           they don't get used.

       "d_attribute_warn_unused_result"
           From d_attribut.U:

           This variable conditionally defines
           "HASATTRIBUTE_WARN_UNUSED_RESULT", which indicates
           that the C compiler can know that certain functions
           have a return values that must not be ignored, such as
           malloc() or open().

       "d_bcmp"
           From d_bcmp.U:

           This variable conditionally defines the "HAS_BCMP"
           symbol if the bcmp() routine is available to compare
           strings.

       "d_bcopy"
           From d_bcopy.U:

           This variable conditionally defines the "HAS_BCOPY"
           symbol if the bcopy() routine is available to copy
           strings.

       "d_bsd"
           From Guess.U:

           This symbol conditionally defines the symbol "BSD"
           when running on a "BSD" system.

       "d_bsdgetpgrp"
           From d_getpgrp.U:

           This variable conditionally defines "USE_BSD_GETPGRP"



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           if getpgrp needs one arguments whereas "USG" one needs
           none.

       "d_bsdsetpgrp"
           From d_setpgrp.U:

           This variable conditionally defines "USE_BSD_SETPGRP"
           if setpgrp needs two arguments whereas "USG" one needs
           none.  See also d_setpgid for a "POSIX" interface.

       "d_builtin_choose_expr"
           From d_builtin.U:

           This conditionally defines "HAS_BUILTIN_CHOOSE_EXPR",
           which indicates that the compiler supports
           __builtin_choose_expr(x,y,z).  This built-in function
           is analogous to the "x?y:z" operator in C, except that
           the expression returned has its type unaltered by
           promotion rules. Also, the built-in function does not
           evaluate the expression that was not chosen.

       "d_builtin_expect"
           From d_builtin.U:

           This conditionally defines "HAS_BUILTIN_EXPECT", which
           indicates that the compiler supports
           __builtin_expect(exp,c).  You may use __builtin_expect
           to provide the compiler with branch prediction
           information.

       "d_bzero"
           From d_bzero.U:

           This variable conditionally defines the "HAS_BZERO"
           symbol if the bzero() routine is available to set
           memory to 0.

       "d_c99_variadic_macros"
           From d_c99_variadic.U:

           This variable conditionally defines the
           HAS_C99_VARIADIC_MACROS symbol, which indicates to the
           C program that C99 variadic macros are available.

       "d_casti32"
           From d_casti32.U:

           This variable conditionally defines CASTI32, which
           indicates whether the C compiler can cast large floats
           to 32-bit ints.

       "d_castneg"
           From d_castneg.U:




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           This variable conditionally defines "CASTNEG", which
           indicates wether the C compiler can cast negative
           float to unsigned.

       "d_charvspr"
           From d_vprintf.U:

           This variable conditionally defines "CHARVSPRINTF" if
           this system has vsprintf returning type (char*).  The
           trend seems to be to declare it as "int vsprintf()".

       "d_chown"
           From d_chown.U:

           This variable conditionally defines the "HAS_CHOWN"
           symbol, which indicates to the C program that the
           chown() routine is available.

       "d_chroot"
           From d_chroot.U:

           This variable conditionally defines the "HAS_CHROOT"
           symbol, which indicates to the C program that the
           chroot() routine is available.

       "d_chsize"
           From d_chsize.U:

           This variable conditionally defines the "CHSIZE"
           symbol, which indicates to the C program that the
           chsize() routine is available to truncate files.  You
           might need a -lx to get this routine.

       "d_class"
           From d_class.U:

           This variable conditionally defines the "HAS_CLASS"
           symbol, which indicates to the C program that the
           class() routine is available.

       "d_clearenv"
           From d_clearenv.U:

           This variable conditionally defines the "HAS_CLEARENV"
           symbol, which indicates to the C program that the
           clearenv () routine is available.

       "d_closedir"
           From d_closedir.U:

           This variable conditionally defines "HAS_CLOSEDIR" if
           closedir() is available.





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       "d_cmsghdr_s"
           From d_cmsghdr_s.U:

           This variable conditionally defines the
           "HAS_STRUCT_CMSGHDR" symbol, which indicates that the
           struct cmsghdr is supported.

       "d_const"
           From d_const.U:

           This variable conditionally defines the "HASCONST"
           symbol, which indicates to the C program that this C
           compiler knows about the const type.

       "d_copysignl"
           From d_copysignl.U:

           This variable conditionally defines the
           "HAS_COPYSIGNL" symbol, which indicates to the C
           program that the copysignl() routine is available.  If
           aintl is also present we can emulate modfl.

       "d_cplusplus"
           From d_cplusplus.U:

           This variable conditionally defines the
           "USE_CPLUSPLUS" symbol, which indicates that a C++
           compiler was used to compiled Perl and will be used to
           compile extensions.

       "d_crypt"
           From d_crypt.U:

           This variable conditionally defines the "CRYPT"
           symbol, which indicates to the C program that the
           crypt() routine is available to encrypt passwords and
           the like.

       "d_crypt_r"
           From d_crypt_r.U:

           This variable conditionally defines the "HAS_CRYPT_R"
           symbol, which indicates to the C program that the
           crypt_r() routine is available.

       "d_csh"
           From d_csh.U:

           This variable conditionally defines the "CSH" symbol,
           which indicates to the C program that the C-shell
           exists.

       "d_ctermid"
           From d_ctermid.U:



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           This variable conditionally defines "CTERMID" if
           ctermid() is available to generate filename for
           terminal.

       "d_ctermid_r"
           From d_ctermid_r.U:

           This variable conditionally defines the
           "HAS_CTERMID_R" symbol, which indicates to the C
           program that the ctermid_r() routine is available.

       "d_ctime64"
           From d_timefuncs64.U:

           This variable conditionally defines the HAS_CTIME64
           symbol, which indicates to the C program that the
           ctime64 () routine is available.

       "d_ctime_r"
           From d_ctime_r.U:

           This variable conditionally defines the "HAS_CTIME_R"
           symbol, which indicates to the C program that the
           ctime_r() routine is available.

       "d_cuserid"
           From d_cuserid.U:

           This variable conditionally defines the "HAS_CUSERID"
           symbol, which indicates to the C program that the
           cuserid() routine is available to get character login
           names.

       "d_dbl_dig"
           From d_dbl_dig.U:

           This variable conditionally defines d_dbl_dig if this
           system's header files provide "DBL_DIG", which is the
           number of significant digits in a double precision
           number.

       "d_dbminitproto"
           From d_dbminitproto.U:

           This variable conditionally defines the
           "HAS_DBMINIT_PROTO" symbol, which indicates to the C
           program that the system provides a prototype for the
           dbminit() function.  Otherwise, it is up to the
           program to supply one.

       "d_difftime"
           From d_difftime.U:

           This variable conditionally defines the "HAS_DIFFTIME"



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           symbol, which indicates to the C program that the
           difftime() routine is available.

       "d_difftime64"
           From d_timefuncs64.U:

           This variable conditionally defines the HAS_DIFFTIME64
           symbol, which indicates to the C program that the
           difftime64 () routine is available.

       "d_dir_dd_fd"
           From d_dir_dd_fd.U:

           This variable conditionally defines the
           "HAS_DIR_DD_FD" symbol, which indicates that the "DIR"
           directory stream type contains a member variable
           called dd_fd.

       "d_dirfd"
           From d_dirfd.U:

           This variable conditionally defines the "HAS_DIRFD"
           constant, which indicates to the C program that
           dirfd() is available to return the file descriptor of
           a directory stream.

       "d_dirnamlen"
           From i_dirent.U:

           This variable conditionally defines "DIRNAMLEN", which
           indicates to the C program that the length of
           directory entry names is provided by a d_namelen
           field.

       "d_dlerror"
           From d_dlerror.U:

           This variable conditionally defines the "HAS_DLERROR"
           symbol, which indicates to the C program that the
           dlerror() routine is available.

       "d_dlopen"
           From d_dlopen.U:

           This variable conditionally defines the "HAS_DLOPEN"
           symbol, which indicates to the C program that the
           dlopen() routine is available.

       "d_dlsymun"
           From d_dlsymun.U:

           This variable conditionally defines
           "DLSYM_NEEDS_UNDERSCORE", which indicates that we need
           to prepend an underscore to the symbol name before



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           calling dlsym().

       "d_dosuid"
           From d_dosuid.U:

           This variable conditionally defines the symbol
           "DOSUID", which tells the C program that it should
           insert setuid emulation code on hosts which have
           setuid #! scripts disabled.

       "d_drand48_r"
           From d_drand48_r.U:

           This variable conditionally defines the HAS_DRAND48_R
           symbol, which indicates to the C program that the
           drand48_r() routine is available.

       "d_drand48proto"
           From d_drand48proto.U:

           This variable conditionally defines the
           HAS_DRAND48_PROTO symbol, which indicates to the C
           program that the system provides a prototype for the
           drand48() function.  Otherwise, it is up to the
           program to supply one.

       "d_dup2"
           From d_dup2.U:

           This variable conditionally defines HAS_DUP2 if dup2()
           is available to duplicate file descriptors.

       "d_eaccess"
           From d_eaccess.U:

           This variable conditionally defines the "HAS_EACCESS"
           symbol, which indicates to the C program that the
           eaccess() routine is available.

       "d_endgrent"
           From d_endgrent.U:

           This variable conditionally defines the "HAS_ENDGRENT"
           symbol, which indicates to the C program that the
           endgrent() routine is available for sequential access
           of the group database.

       "d_endgrent_r"
           From d_endgrent_r.U:

           This variable conditionally defines the
           "HAS_ENDGRENT_R" symbol, which indicates to the C
           program that the endgrent_r() routine is available.




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       "d_endhent"
           From d_endhent.U:

           This variable conditionally defines "HAS_ENDHOSTENT"
           if endhostent() is available to close whatever was
           being used for host queries.

       "d_endhostent_r"
           From d_endhostent_r.U:

           This variable conditionally defines the
           "HAS_ENDHOSTENT_R" symbol, which indicates to the C
           program that the endhostent_r() routine is available.

       "d_endnent"
           From d_endnent.U:

           This variable conditionally defines "HAS_ENDNETENT" if
           endnetent() is available to close whatever was being
           used for network queries.

       "d_endnetent_r"
           From d_endnetent_r.U:

           This variable conditionally defines the
           "HAS_ENDNETENT_R" symbol, which indicates to the C
           program that the endnetent_r() routine is available.

       "d_endpent"
           From d_endpent.U:

           This variable conditionally defines "HAS_ENDPROTOENT"
           if endprotoent() is available to close whatever was
           being used for protocol queries.

       "d_endprotoent_r"
           From d_endprotoent_r.U:

           This variable conditionally defines the
           "HAS_ENDPROTOENT_R" symbol, which indicates to the C
           program that the endprotoent_r() routine is available.

       "d_endpwent"
           From d_endpwent.U:

           This variable conditionally defines the "HAS_ENDPWENT"
           symbol, which indicates to the C program that the
           endpwent() routine is available for sequential access
           of the passwd database.

       "d_endpwent_r"
           From d_endpwent_r.U:

           This variable conditionally defines the



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           "HAS_ENDPWENT_R" symbol, which indicates to the C
           program that the endpwent_r() routine is available.

       "d_endsent"
           From d_endsent.U:

           This variable conditionally defines "HAS_ENDSERVENT"
           if endservent() is available to close whatever was
           being used for service queries.

       "d_endservent_r"
           From d_endservent_r.U:

           This variable conditionally defines the
           "HAS_ENDSERVENT_R" symbol, which indicates to the C
           program that the endservent_r() routine is available.

       "d_eofnblk"
           From nblock_io.U:

           This variable conditionally defines "EOF_NONBLOCK" if
           "EOF" can be seen when reading from a non-blocking I/O
           source.

       "d_eunice"
           From Guess.U:

           This variable conditionally defines the symbols
           "EUNICE" and "VAX", which alerts the C program that it
           must deal with ideosyncracies of "VMS".

       "d_faststdio"
           From d_faststdio.U:

           This variable conditionally defines the
           "HAS_FAST_STDIO" symbol, which indicates to the C
           program that the "fast stdio" is available to
           manipulate the stdio buffers directly.

       "d_fchdir"
           From d_fchdir.U:

           This variable conditionally defines the "HAS_FCHDIR"
           symbol, which indicates to the C program that the
           fchdir() routine is available.

       "d_fchmod"
           From d_fchmod.U:

           This variable conditionally defines the "HAS_FCHMOD"
           symbol, which indicates to the C program that the
           fchmod() routine is available to change mode of opened
           files.




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       "d_fchown"
           From d_fchown.U:

           This variable conditionally defines the "HAS_FCHOWN"
           symbol, which indicates to the C program that the
           fchown() routine is available to change ownership of
           opened files.

       "d_fcntl"
           From d_fcntl.U:

           This variable conditionally defines the "HAS_FCNTL"
           symbol, and indicates whether the fcntl() function
           exists

       "d_fcntl_can_lock"
           From d_fcntl_can_lock.U:

           This variable conditionally defines the
           "FCNTL_CAN_LOCK" symbol and indicates whether file
           locking with fcntl() works.

       "d_fd_macros"
           From d_fd_set.U:

           This variable contains the eventual value of the
           "HAS_FD_MACROS" symbol, which indicates if your C
           compiler knows about the macros which manipulate an
           fd_set.

       "d_fd_set"
           From d_fd_set.U:

           This variable contains the eventual value of the
           "HAS_FD_SET" symbol, which indicates if your C
           compiler knows about the fd_set typedef.

       "d_fds_bits"
           From d_fd_set.U:

           This variable contains the eventual value of the
           "HAS_FDS_BITS" symbol, which indicates if your fd_set
           typedef contains the fds_bits member.  If you have an
           fd_set typedef, but the dweebs who installed it did a
           half-fast job and neglected to provide the macros to
           manipulate an fd_set, "HAS_FDS_BITS" will let us know
           how to fix the gaffe.

       "d_fgetpos"
           From d_fgetpos.U:

           This variable conditionally defines "HAS_FGETPOS" if
           fgetpos() is available to get the file position
           indicator.



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       "d_finite"
           From d_finite.U:

           This variable conditionally defines the "HAS_FINITE"
           symbol, which indicates to the C program that the
           finite() routine is available.

       "d_finitel"
           From d_finitel.U:

           This variable conditionally defines the "HAS_FINITEL"
           symbol, which indicates to the C program that the
           finitel() routine is available.

       "d_flexfnam"
           From d_flexfnam.U:

           This variable conditionally defines the
           "FLEXFILENAMES" symbol, which indicates that the
           system supports filenames longer than 14 characters.

       "d_flock"
           From d_flock.U:

           This variable conditionally defines "HAS_FLOCK" if
           flock() is available to do file locking.

       "d_flockproto"
           From d_flockproto.U:

           This variable conditionally defines the
           "HAS_FLOCK_PROTO" symbol, which indicates to the C
           program that the system provides a prototype for the
           flock() function.  Otherwise, it is up to the program
           to supply one.

       "d_fork"
           From d_fork.U:

           This variable conditionally defines the "HAS_FORK"
           symbol, which indicates to the C program that the
           fork() routine is available.

       "d_fp_class"
           From d_fp_class.U:

           This variable conditionally defines the "HAS_FP_CLASS"
           symbol, which indicates to the C program that the
           fp_class() routine is available.

       "d_fpathconf"
           From d_pathconf.U:

           This variable conditionally defines the



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           "HAS_FPATHCONF" symbol, which indicates to the C
           program that the pathconf() routine is available to
           determine file-system related limits and options
           associated with a given open file descriptor.

       "d_fpclass"
           From d_fpclass.U:

           This variable conditionally defines the "HAS_FPCLASS"
           symbol, which indicates to the C program that the
           fpclass() routine is available.

       "d_fpclassify"
           From d_fpclassify.U:

           This variable conditionally defines the
           "HAS_FPCLASSIFY" symbol, which indicates to the C
           program that the fpclassify() routine is available.

       "d_fpclassl"
           From d_fpclassl.U:

           This variable conditionally defines the "HAS_FPCLASSL"
           symbol, which indicates to the C program that the
           fpclassl() routine is available.

       "d_fpos64_t"
           From d_fpos64_t.U:

           This symbol will be defined if the C compiler supports
           fpos64_t.

       "d_frexpl"
           From d_frexpl.U:

           This variable conditionally defines the "HAS_FREXPL"
           symbol, which indicates to the C program that the
           frexpl() routine is available.

       "d_fs_data_s"
           From d_fs_data_s.U:

           This variable conditionally defines the
           "HAS_STRUCT_FS_DATA" symbol, which indicates that the
           struct fs_data is supported.

       "d_fseeko"
           From d_fseeko.U:

           This variable conditionally defines the "HAS_FSEEKO"
           symbol, which indicates to the C program that the
           fseeko() routine is available.





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       "d_fsetpos"
           From d_fsetpos.U:

           This variable conditionally defines "HAS_FSETPOS" if
           fsetpos() is available to set the file position
           indicator.

       "d_fstatfs"
           From d_fstatfs.U:

           This variable conditionally defines the "HAS_FSTATFS"
           symbol, which indicates to the C program that the
           fstatfs() routine is available.

       "d_fstatvfs"
           From d_statvfs.U:

           This variable conditionally defines the "HAS_FSTATVFS"
           symbol, which indicates to the C program that the
           fstatvfs() routine is available.

       "d_fsync"
           From d_fsync.U:

           This variable conditionally defines the "HAS_FSYNC"
           symbol, which indicates to the C program that the
           fsync() routine is available.

       "d_ftello"
           From d_ftello.U:

           This variable conditionally defines the "HAS_FTELLO"
           symbol, which indicates to the C program that the
           ftello() routine is available.

       "d_ftime"
           From d_ftime.U:

           This variable conditionally defines the "HAS_FTIME"
           symbol, which indicates that the ftime() routine
           exists.  The ftime() routine is basically a sub-second
           accuracy clock.

       "d_futimes"
           From d_futimes.U:

           This variable conditionally defines the "HAS_FUTIMES"
           symbol, which indicates to the C program that the
           futimes() routine is available.

       "d_Gconvert"
           From d_gconvert.U:

           This variable holds what Gconvert is defined as to



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           convert floating point numbers into strings.  By
           default, Configure sets "this" macro to use the first
           of gconvert, gcvt, or sprintf that pass
           sprintf-%g-like behaviour tests.  If perl is using
           long doubles, the macro uses the first of the
           following functions that pass Configure's tests:
           qgcvt, sprintf (if Configure knows how to make sprintf
           format long doubles--see sPRIgldbl), gconvert, gcvt,
           and sprintf (casting to double).  The
           gconvert_preference and gconvert_ld_preference
           variables can be used to alter Configure's
           preferences, for doubles and long doubles,
           respectively.  If present, they contain a space-
           separated list of one or more of the above function
           names in the order they should be tried.

           d_Gconvert may be set to override Configure with a
           platform- specific function.  If this function expects
           a double, a different value may need to be set by the
           uselongdouble.cbu call-back unit so that long doubles
           can be formatted without loss of precision.

       "d_gdbm_ndbm_h_uses_prototypes"
           From i_ndbm.U:

           This variable conditionally defines the
           "NDBM_H_USES_PROTOTYPES" symbol, which indicates that
           the gdbm-ndbm.h include file uses real "ANSI" C
           prototypes instead of K&R style function declarations.
           K&R style declarations are unsupported in C++, so the
           include file requires special handling when using a
           C++ compiler and this variable is undefined. Consult
           the different d_*ndbm_h_uses_prototypes variables to
           get the same information for alternative ndbm.h
           include files.

       "d_gdbmndbm_h_uses_prototypes"
           From i_ndbm.U:

           This variable conditionally defines the
           "NDBM_H_USES_PROTOTYPES" symbol, which indicates that
           the gdbm/ndbm.h include file uses real "ANSI" C
           prototypes instead of K&R style function declarations.
           K&R style declarations are unsupported in C++, so the
           include file requires special handling when using a
           C++ compiler and this variable is undefined. Consult
           the different d_*ndbm_h_uses_prototypes variables to
           get the same information for alternative ndbm.h
           include files.

       "d_getaddrinfo"
           From d_getaddrinfo.U:

           This variable conditionally defines the



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           "HAS_GETADDRINFO" symbol, which indicates to the C
           program that the getaddrinfo() function is available.

       "d_getcwd"
           From d_getcwd.U:

           This variable conditionally defines the "HAS_GETCWD"
           symbol, which indicates to the C program that the
           getcwd() routine is available to get the current
           working directory.

       "d_getespwnam"
           From d_getespwnam.U:

           This variable conditionally defines "HAS_GETESPWNAM"
           if getespwnam() is available to retrieve enchanced
           (shadow) password entries by name.

       "d_getfsstat"
           From d_getfsstat.U:

           This variable conditionally defines the
           "HAS_GETFSSTAT" symbol, which indicates to the C
           program that the getfsstat() routine is available.

       "d_getgrent"
           From d_getgrent.U:

           This variable conditionally defines the "HAS_GETGRENT"
           symbol, which indicates to the C program that the
           getgrent() routine is available for sequential access
           of the group database.

       "d_getgrent_r"
           From d_getgrent_r.U:

           This variable conditionally defines the
           "HAS_GETGRENT_R" symbol, which indicates to the C
           program that the getgrent_r() routine is available.

       "d_getgrgid_r"
           From d_getgrgid_r.U:

           This variable conditionally defines the
           "HAS_GETGRGID_R" symbol, which indicates to the C
           program that the getgrgid_r() routine is available.

       "d_getgrnam_r"
           From d_getgrnam_r.U:

           This variable conditionally defines the
           "HAS_GETGRNAM_R" symbol, which indicates to the C
           program that the getgrnam_r() routine is available.




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       "d_getgrps"
           From d_getgrps.U:

           This variable conditionally defines the
           "HAS_GETGROUPS" symbol, which indicates to the C
           program that the getgroups() routine is available to
           get the list of process groups.

       "d_gethbyaddr"
           From d_gethbyad.U:

           This variable conditionally defines the
           "HAS_GETHOSTBYADDR" symbol, which indicates to the C
           program that the gethostbyaddr() routine is available
           to look up hosts by their "IP" addresses.

       "d_gethbyname"
           From d_gethbynm.U:

           This variable conditionally defines the
           "HAS_GETHOSTBYNAME" symbol, which indicates to the C
           program that the gethostbyname() routine is available
           to look up host names in some data base or other.

       "d_gethent"
           From d_gethent.U:

           This variable conditionally defines "HAS_GETHOSTENT"
           if gethostent() is available to look up host names in
           some data base or another.

       "d_gethname"
           From d_gethname.U:

           This variable conditionally defines the
           "HAS_GETHOSTNAME" symbol, which indicates to the C
           program that the gethostname() routine may be used to
           derive the host name.

       "d_gethostbyaddr_r"
           From d_gethostbyaddr_r.U:

           This variable conditionally defines the
           "HAS_GETHOSTBYADDR_R" symbol, which indicates to the C
           program that the gethostbyaddr_r() routine is
           available.

       "d_gethostbyname_r"
           From d_gethostbyname_r.U:

           This variable conditionally defines the
           "HAS_GETHOSTBYNAME_R" symbol, which indicates to the C
           program that the gethostbyname_r() routine is
           available.



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       "d_gethostent_r"
           From d_gethostent_r.U:

           This variable conditionally defines the
           "HAS_GETHOSTENT_R" symbol, which indicates to the C
           program that the gethostent_r() routine is available.

       "d_gethostprotos"
           From d_gethostprotos.U:

           This variable conditionally defines the
           "HAS_GETHOST_PROTOS" symbol, which indicates to the C
           program that <netdb.h> supplies prototypes for the
           various gethost*() functions.  See also netdbtype.U
           for probing for various netdb types.

       "d_getitimer"
           From d_getitimer.U:

           This variable conditionally defines the
           "HAS_GETITIMER" symbol, which indicates to the C
           program that the getitimer() routine is available.

       "d_getlogin"
           From d_getlogin.U:

           This variable conditionally defines the "HAS_GETLOGIN"
           symbol, which indicates to the C program that the
           getlogin() routine is available to get the login name.

       "d_getlogin_r"
           From d_getlogin_r.U:

           This variable conditionally defines the
           "HAS_GETLOGIN_R" symbol, which indicates to the C
           program that the getlogin_r() routine is available.

       "d_getmnt"
           From d_getmnt.U:

           This variable conditionally defines the "HAS_GETMNT"
           symbol, which indicates to the C program that the
           getmnt() routine is available to retrieve one or more
           mount info blocks by filename.

       "d_getmntent"
           From d_getmntent.U:

           This variable conditionally defines the
           "HAS_GETMNTENT" symbol, which indicates to the C
           program that the getmntent() routine is available to
           iterate through mounted files to get their mount info.





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       "d_getnameinfo"
           From d_getnameinfo.U:

           This variable conditionally defines the
           "HAS_GETNAMEINFO" symbol, which indicates to the C
           program that the getnameinfo() function is available.

       "d_getnbyaddr"
           From d_getnbyad.U:

           This variable conditionally defines the
           "HAS_GETNETBYADDR" symbol, which indicates to the C
           program that the getnetbyaddr() routine is available
           to look up networks by their "IP" addresses.

       "d_getnbyname"
           From d_getnbynm.U:

           This variable conditionally defines the
           "HAS_GETNETBYNAME" symbol, which indicates to the C
           program that the getnetbyname() routine is available
           to look up networks by their names.

       "d_getnent"
           From d_getnent.U:

           This variable conditionally defines "HAS_GETNETENT" if
           getnetent() is available to look up network names in
           some data base or another.

       "d_getnetbyaddr_r"
           From d_getnetbyaddr_r.U:

           This variable conditionally defines the
           "HAS_GETNETBYADDR_R" symbol, which indicates to the C
           program that the getnetbyaddr_r() routine is
           available.

       "d_getnetbyname_r"
           From d_getnetbyname_r.U:

           This variable conditionally defines the
           "HAS_GETNETBYNAME_R" symbol, which indicates to the C
           program that the getnetbyname_r() routine is
           available.

       "d_getnetent_r"
           From d_getnetent_r.U:

           This variable conditionally defines the
           "HAS_GETNETENT_R" symbol, which indicates to the C
           program that the getnetent_r() routine is available.





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       "d_getnetprotos"
           From d_getnetprotos.U:

           This variable conditionally defines the
           "HAS_GETNET_PROTOS" symbol, which indicates to the C
           program that <netdb.h> supplies prototypes for the
           various getnet*() functions.  See also netdbtype.U for
           probing for various netdb types.

       "d_getpagsz"
           From d_getpagsz.U:

           This variable conditionally defines "HAS_GETPAGESIZE"
           if getpagesize() is available to get the system page
           size.

       "d_getpbyname"
           From d_getprotby.U:

           This variable conditionally defines the
           "HAS_GETPROTOBYNAME" symbol, which indicates to the C
           program that the getprotobyname() routine is available
           to look up protocols by their name.

       "d_getpbynumber"
           From d_getprotby.U:

           This variable conditionally defines the
           "HAS_GETPROTOBYNUMBER" symbol, which indicates to the
           C program that the getprotobynumber() routine is
           available to look up protocols by their number.

       "d_getpent"
           From d_getpent.U:

           This variable conditionally defines "HAS_GETPROTOENT"
           if getprotoent() is available to look up protocols in
           some data base or another.

       "d_getpgid"
           From d_getpgid.U:

           This variable conditionally defines the "HAS_GETPGID"
           symbol, which indicates to the C program that the
           getpgid(pid) function is available to get the process
           group id.

       "d_getpgrp"
           From d_getpgrp.U:

           This variable conditionally defines "HAS_GETPGRP" if
           getpgrp() is available to get the current process
           group.




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       "d_getpgrp2"
           From d_getpgrp2.U:

           This variable conditionally defines the HAS_GETPGRP2
           symbol, which indicates to the C program that the
           getpgrp2() (as in DG/"UX") routine is available to get
           the current process group.

       "d_getppid"
           From d_getppid.U:

           This variable conditionally defines the "HAS_GETPPID"
           symbol, which indicates to the C program that the
           getppid() routine is available to get the parent
           process "ID".

       "d_getprior"
           From d_getprior.U:

           This variable conditionally defines "HAS_GETPRIORITY"
           if getpriority() is available to get a process's
           priority.

       "d_getprotobyname_r"
           From d_getprotobyname_r.U:

           This variable conditionally defines the
           "HAS_GETPROTOBYNAME_R" symbol, which indicates to the
           C program that the getprotobyname_r() routine is
           available.

       "d_getprotobynumber_r"
           From d_getprotobynumber_r.U:

           This variable conditionally defines the
           "HAS_GETPROTOBYNUMBER_R" symbol, which indicates to
           the C program that the getprotobynumber_r() routine is
           available.

       "d_getprotoent_r"
           From d_getprotoent_r.U:

           This variable conditionally defines the
           "HAS_GETPROTOENT_R" symbol, which indicates to the C
           program that the getprotoent_r() routine is available.

       "d_getprotoprotos"
           From d_getprotoprotos.U:

           This variable conditionally defines the
           "HAS_GETPROTO_PROTOS" symbol, which indicates to the C
           program that <netdb.h> supplies prototypes for the
           various getproto*() functions.  See also netdbtype.U
           for probing for various netdb types.



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       "d_getprpwnam"
           From d_getprpwnam.U:

           This variable conditionally defines "HAS_GETPRPWNAM"
           if getprpwnam() is available to retrieve protected
           (shadow) password entries by name.

       "d_getpwent"
           From d_getpwent.U:

           This variable conditionally defines the "HAS_GETPWENT"
           symbol, which indicates to the C program that the
           getpwent() routine is available for sequential access
           of the passwd database.

       "d_getpwent_r"
           From d_getpwent_r.U:

           This variable conditionally defines the
           "HAS_GETPWENT_R" symbol, which indicates to the C
           program that the getpwent_r() routine is available.

       "d_getpwnam_r"
           From d_getpwnam_r.U:

           This variable conditionally defines the
           "HAS_GETPWNAM_R" symbol, which indicates to the C
           program that the getpwnam_r() routine is available.

       "d_getpwuid_r"
           From d_getpwuid_r.U:

           This variable conditionally defines the
           "HAS_GETPWUID_R" symbol, which indicates to the C
           program that the getpwuid_r() routine is available.

       "d_getsbyname"
           From d_getsrvby.U:

           This variable conditionally defines the
           "HAS_GETSERVBYNAME" symbol, which indicates to the C
           program that the getservbyname() routine is available
           to look up services by their name.

       "d_getsbyport"
           From d_getsrvby.U:

           This variable conditionally defines the
           "HAS_GETSERVBYPORT" symbol, which indicates to the C
           program that the getservbyport() routine is available
           to look up services by their port.

       "d_getsent"
           From d_getsent.U:



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           This variable conditionally defines "HAS_GETSERVENT"
           if getservent() is available to look up network
           services in some data base or another.

       "d_getservbyname_r"
           From d_getservbyname_r.U:

           This variable conditionally defines the
           "HAS_GETSERVBYNAME_R" symbol, which indicates to the C
           program that the getservbyname_r() routine is
           available.

       "d_getservbyport_r"
           From d_getservbyport_r.U:

           This variable conditionally defines the
           "HAS_GETSERVBYPORT_R" symbol, which indicates to the C
           program that the getservbyport_r() routine is
           available.

       "d_getservent_r"
           From d_getservent_r.U:

           This variable conditionally defines the
           "HAS_GETSERVENT_R" symbol, which indicates to the C
           program that the getservent_r() routine is available.

       "d_getservprotos"
           From d_getservprotos.U:

           This variable conditionally defines the
           "HAS_GETSERV_PROTOS" symbol, which indicates to the C
           program that <netdb.h> supplies prototypes for the
           various getserv*() functions.  See also netdbtype.U
           for probing for various netdb types.

       "d_getspnam"
           From d_getspnam.U:

           This variable conditionally defines "HAS_GETSPNAM" if
           getspnam() is available to retrieve SysV shadow
           password entries by name.

       "d_getspnam_r"
           From d_getspnam_r.U:

           This variable conditionally defines the
           "HAS_GETSPNAM_R" symbol, which indicates to the C
           program that the getspnam_r() routine is available.

       "d_gettimeod"
           From d_ftime.U:

           This variable conditionally defines the



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           "HAS_GETTIMEOFDAY" symbol, which indicates that the
           gettimeofday() system call exists (to obtain a sub-
           second accuracy clock). You should probably include
           <sys/resource.h>.

       "d_gmtime64"
           From d_timefuncs64.U:

           This variable conditionally defines the HAS_GMTIME64
           symbol, which indicates to the C program that the
           gmtime64 () routine is available.

       "d_gmtime_r"
           From d_gmtime_r.U:

           This variable conditionally defines the "HAS_GMTIME_R"
           symbol, which indicates to the C program that the
           gmtime_r() routine is available.

       "d_gnulibc"
           From d_gnulibc.U:

           Defined if we're dealing with the "GNU" C Library.

       "d_grpasswd"
           From i_grp.U:

           This variable conditionally defines "GRPASSWD", which
           indicates that struct group in <grp.h> contains
           gr_passwd.

       "d_hasmntopt"
           From d_hasmntopt.U:

           This variable conditionally defines the
           "HAS_HASMNTOPT" symbol, which indicates to the C
           program that the hasmntopt() routine is available to
           query the mount options of file systems.

       "d_htonl"
           From d_htonl.U:

           This variable conditionally defines "HAS_HTONL" if
           htonl() and its friends are available to do network
           order byte swapping.

       "d_ilogbl"
           From d_ilogbl.U:

           This variable conditionally defines the "HAS_ILOGBL"
           symbol, which indicates to the C program that the
           ilogbl() routine is available.  If scalbnl is also
           present we can emulate frexpl.




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       "d_inc_version_list"
           From inc_version_list.U:

           This variable conditionally defines
           "PERL_INC_VERSION_LIST".  It is set to undef when
           "PERL_INC_VERSION_LIST" is empty.

       "d_index"
           From d_strchr.U:

           This variable conditionally defines "HAS_INDEX" if
           index() and rindex() are available for string
           searching.

       "d_inetaton"
           From d_inetaton.U:

           This variable conditionally defines the
           "HAS_INET_ATON" symbol, which indicates to the C
           program that the inet_aton() function is available to
           parse "IP" address "dotted-quad" strings.

       "d_inetntop"
           From d_inetntop.U:

           This variable conditionally defines the "HAS_INETNTOP"
           symbol, which indicates to the C program that the
           inet_ntop() function is available.

       "d_inetpton"
           From d_inetpton.U:

           This variable conditionally defines the "HAS_INETPTON"
           symbol, which indicates to the C program that the
           inet_pton() function is available.

       "d_int64_t"
           From d_int64_t.U:

           This symbol will be defined if the C compiler supports
           int64_t.

       "d_isascii"
           From d_isascii.U:

           This variable conditionally defines the "HAS_ISASCII"
           constant, which indicates to the C program that
           isascii() is available.

       "d_isfinite"
           From d_isfinite.U:

           This variable conditionally defines the "HAS_ISFINITE"
           symbol, which indicates to the C program that the



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           isfinite() routine is available.

       "d_isinf"
           From d_isinf.U:

           This variable conditionally defines the "HAS_ISINF"
           symbol, which indicates to the C program that the
           isinf() routine is available.

       "d_isnan"
           From d_isnan.U:

           This variable conditionally defines the "HAS_ISNAN"
           symbol, which indicates to the C program that the
           isnan() routine is available.

       "d_isnanl"
           From d_isnanl.U:

           This variable conditionally defines the "HAS_ISNANL"
           symbol, which indicates to the C program that the
           isnanl() routine is available.

       "d_killpg"
           From d_killpg.U:

           This variable conditionally defines the "HAS_KILLPG"
           symbol, which indicates to the C program that the
           killpg() routine is available to kill process groups.

       "d_lchown"
           From d_lchown.U:

           This variable conditionally defines the "HAS_LCHOWN"
           symbol, which indicates to the C program that the
           lchown() routine is available to operate on a symbolic
           link (instead of following the link).

       "d_ldbl_dig"
           From d_ldbl_dig.U:

           This variable conditionally defines d_ldbl_dig if this
           system's header files provide "LDBL_DIG", which is the
           number of significant digits in a long double
           precision number.

       "d_libm_lib_version"
           From d_libm_lib_version.U:

           This variable conditionally defines the
           "LIBM_LIB_VERSION" symbol, which indicates to the C
           program that math.h defines "_LIB_VERSION" being
           available in libm




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       "d_link"
           From d_link.U:

           This variable conditionally defines "HAS_LINK" if
           link() is available to create hard links.

       "d_localtime64"
           From d_timefuncs64.U:

           This variable conditionally defines the
           HAS_LOCALTIME64 symbol, which indicates to the C
           program that the localtime64 () routine is available.

       "d_localtime_r"
           From d_localtime_r.U:

           This variable conditionally defines the
           "HAS_LOCALTIME_R" symbol, which indicates to the C
           program that the localtime_r() routine is available.

       "d_localtime_r_needs_tzset"
           From d_localtime_r.U:

           This variable conditionally defines the
           "LOCALTIME_R_NEEDS_TZSET" symbol, which makes us call
           tzset before localtime_r()

       "d_locconv"
           From d_locconv.U:

           This variable conditionally defines "HAS_LOCALECONV"
           if localeconv() is available for numeric and monetary
           formatting conventions.

       "d_lockf"
           From d_lockf.U:

           This variable conditionally defines "HAS_LOCKF" if
           lockf() is available to do file locking.

       "d_longdbl"
           From d_longdbl.U:

           This variable conditionally defines "HAS_LONG_DOUBLE"
           if the long double type is supported.

       "d_longlong"
           From d_longlong.U:

           This variable conditionally defines "HAS_LONG_LONG" if
           the long long type is supported.

       "d_lseekproto"
           From d_lseekproto.U:



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           This variable conditionally defines the
           "HAS_LSEEK_PROTO" symbol, which indicates to the C
           program that the system provides a prototype for the
           lseek() function.  Otherwise, it is up to the program
           to supply one.

       "d_lstat"
           From d_lstat.U:

           This variable conditionally defines "HAS_LSTAT" if
           lstat() is available to do file stats on symbolic
           links.

       "d_madvise"
           From d_madvise.U:

           This variable conditionally defines "HAS_MADVISE" if
           madvise() is available to map a file into memory.

       "d_malloc_good_size"
           From d_malloc_size.U:

           This symbol, if defined, indicates that the
           malloc_good_size routine is available for use.

       "d_malloc_size"
           From d_malloc_size.U:

           This symbol, if defined, indicates that the
           malloc_size routine is available for use.

       "d_mblen"
           From d_mblen.U:

           This variable conditionally defines the "HAS_MBLEN"
           symbol, which indicates to the C program that the
           mblen() routine is available to find the number of
           bytes in a multibye character.

       "d_mbstowcs"
           From d_mbstowcs.U:

           This variable conditionally defines the "HAS_MBSTOWCS"
           symbol, which indicates to the C program that the
           mbstowcs() routine is available to convert a multibyte
           string into a wide character string.

       "d_mbtowc"
           From d_mbtowc.U:

           This variable conditionally defines the "HAS_MBTOWC"
           symbol, which indicates to the C program that the
           mbtowc() routine is available to convert multibyte to
           a wide character.



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       "d_memchr"
           From d_memchr.U:

           This variable conditionally defines the "HAS_MEMCHR"
           symbol, which indicates to the C program that the
           memchr() routine is available to locate characters
           within a C string.

       "d_memcmp"
           From d_memcmp.U:

           This variable conditionally defines the "HAS_MEMCMP"
           symbol, which indicates to the C program that the
           memcmp() routine is available to compare blocks of
           memory.

       "d_memcpy"
           From d_memcpy.U:

           This variable conditionally defines the "HAS_MEMCPY"
           symbol, which indicates to the C program that the
           memcpy() routine is available to copy blocks of
           memory.

       "d_memmove"
           From d_memmove.U:

           This variable conditionally defines the "HAS_MEMMOVE"
           symbol, which indicates to the C program that the
           memmove() routine is available to copy potentatially
           overlapping blocks of memory.

       "d_memset"
           From d_memset.U:

           This variable conditionally defines the "HAS_MEMSET"
           symbol, which indicates to the C program that the
           memset() routine is available to set blocks of memory.

       "d_mkdir"
           From d_mkdir.U:

           This variable conditionally defines the "HAS_MKDIR"
           symbol, which indicates to the C program that the
           mkdir() routine is available to create directories..

       "d_mkdtemp"
           From d_mkdtemp.U:

           This variable conditionally defines the "HAS_MKDTEMP"
           symbol, which indicates to the C program that the
           mkdtemp() routine is available to exclusively create a
           uniquely named temporary directory.




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       "d_mkfifo"
           From d_mkfifo.U:

           This variable conditionally defines the "HAS_MKFIFO"
           symbol, which indicates to the C program that the
           mkfifo() routine is available.

       "d_mkstemp"
           From d_mkstemp.U:

           This variable conditionally defines the "HAS_MKSTEMP"
           symbol, which indicates to the C program that the
           mkstemp() routine is available to exclusively create
           and open a uniquely named temporary file.

       "d_mkstemps"
           From d_mkstemps.U:

           This variable conditionally defines the "HAS_MKSTEMPS"
           symbol, which indicates to the C program that the
           mkstemps() routine is available to exclusively create
           and open a uniquely named (with a suffix) temporary
           file.

       "d_mktime"
           From d_mktime.U:

           This variable conditionally defines the "HAS_MKTIME"
           symbol, which indicates to the C program that the
           mktime() routine is available.

       "d_mktime64"
           From d_timefuncs64.U:

           This variable conditionally defines the HAS_MKTIME64
           symbol, which indicates to the C program that the
           mktime64 () routine is available.

       "d_mmap"
           From d_mmap.U:

           This variable conditionally defines "HAS_MMAP" if
           mmap() is available to map a file into memory.

       "d_modfl"
           From d_modfl.U:

           This variable conditionally defines the "HAS_MODFL"
           symbol, which indicates to the C program that the
           modfl() routine is available.

       "d_modfl_pow32_bug"
           From d_modfl.U:




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           This variable conditionally defines the
           HAS_MODFL_POW32_BUG symbol, which indicates that
           modfl() is broken for long doubles >= pow(2, 32).  For
           example from 4294967303.150000 one would get
           4294967302.000000 and 1.150000.  The bug has been seen
           in certain versions of glibc, release 2.2.2 is known
           to be okay.

       "d_modflproto"
           From d_modfl.U:

           This symbol, if defined, indicates that the system
           provides a prototype for the modfl() function.
           Otherwise, it is up to the program to supply one.  C99
           says it should be long double modfl(long double, long
           double *);

       "d_mprotect"
           From d_mprotect.U:

           This variable conditionally defines "HAS_MPROTECT" if
           mprotect() is available to modify the access
           protection of a memory mapped file.

       "d_msg"
           From d_msg.U:

           This variable conditionally defines the "HAS_MSG"
           symbol, which indicates that the entire msg*(2)
           library is present.

       "d_msg_ctrunc"
           From d_socket.U:

           This variable conditionally defines the
           "HAS_MSG_CTRUNC" symbol, which indicates that the
           "MSG_CTRUNC" is available.  #ifdef is not enough
           because it may be an enum, glibc has been known to do
           this.

       "d_msg_dontroute"
           From d_socket.U:

           This variable conditionally defines the
           "HAS_MSG_DONTROUTE" symbol, which indicates that the
           "MSG_DONTROUTE" is available.  #ifdef is not enough
           because it may be an enum, glibc has been known to do
           this.

       "d_msg_oob"
           From d_socket.U:

           This variable conditionally defines the "HAS_MSG_OOB"
           symbol, which indicates that the "MSG_OOB" is



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           available.  #ifdef is not enough because it may be an
           enum, glibc has been known to do this.

       "d_msg_peek"
           From d_socket.U:

           This variable conditionally defines the "HAS_MSG_PEEK"
           symbol, which indicates that the "MSG_PEEK" is
           available.  #ifdef is not enough because it may be an
           enum, glibc has been known to do this.

       "d_msg_proxy"
           From d_socket.U:

           This variable conditionally defines the
           "HAS_MSG_PROXY" symbol, which indicates that the
           "MSG_PROXY" is available.  #ifdef is not enough
           because it may be an enum, glibc has been known to do
           this.

       "d_msgctl"
           From d_msgctl.U:

           This variable conditionally defines the "HAS_MSGCTL"
           symbol, which indicates to the C program that the
           msgctl() routine is available.

       "d_msgget"
           From d_msgget.U:

           This variable conditionally defines the "HAS_MSGGET"
           symbol, which indicates to the C program that the
           msgget() routine is available.

       "d_msghdr_s"
           From d_msghdr_s.U:

           This variable conditionally defines the
           "HAS_STRUCT_MSGHDR" symbol, which indicates that the
           struct msghdr is supported.

       "d_msgrcv"
           From d_msgrcv.U:

           This variable conditionally defines the "HAS_MSGRCV"
           symbol, which indicates to the C program that the
           msgrcv() routine is available.

       "d_msgsnd"
           From d_msgsnd.U:

           This variable conditionally defines the "HAS_MSGSND"
           symbol, which indicates to the C program that the
           msgsnd() routine is available.



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       "d_msync"
           From d_msync.U:

           This variable conditionally defines "HAS_MSYNC" if
           msync() is available to synchronize a mapped file.

       "d_munmap"
           From d_munmap.U:

           This variable conditionally defines "HAS_MUNMAP" if
           munmap() is available to unmap a region mapped by
           mmap().

       "d_mymalloc"
           From mallocsrc.U:

           This variable conditionally defines "MYMALLOC" in case
           other parts of the source want to take special action
           if "MYMALLOC" is used.  This may include different
           sorts of profiling or error detection.

       "d_ndbm"
           From i_ndbm.U:

           This variable conditionally defines the "HAS_NDBM"
           symbol, which indicates that both the ndbm.h include
           file and an appropriate ndbm library exist.  Consult
           the different i_*ndbm variables to find out the actual
           include location.  Sometimes, a system has the header
           file but not the library.  This variable will only be
           set if the system has both.

       "d_ndbm_h_uses_prototypes"
           From i_ndbm.U:

           This variable conditionally defines the
           "NDBM_H_USES_PROTOTYPES" symbol, which indicates that
           the ndbm.h include file uses real "ANSI" C prototypes
           instead of K&R style function declarations. K&R style
           declarations are unsupported in C++, so the include
           file requires special handling when using a C++
           compiler and this variable is undefined. Consult the
           different d_*ndbm_h_uses_prototypes variables to get
           the same information for alternative ndbm.h include
           files.

       "d_nice"
           From d_nice.U:

           This variable conditionally defines the "HAS_NICE"
           symbol, which indicates to the C program that the
           nice() routine is available.





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       "d_nl_langinfo"
           From d_nl_langinfo.U:

           This variable conditionally defines the
           "HAS_NL_LANGINFO" symbol, which indicates to the C
           program that the nl_langinfo() routine is available.

       "d_nv_preserves_uv"
           From perlxv.U:

           This variable indicates whether a variable of type
           nvtype can preserve all the bits a variable of type
           uvtype.

       "d_nv_zero_is_allbits_zero"
           From perlxv.U:

           This variable indicates whether a variable of type
           nvtype stores 0.0 in memory as all bits zero.

       "d_off64_t"
           From d_off64_t.U:

           This symbol will be defined if the C compiler supports
           off64_t.

       "d_old_pthread_create_joinable"
           From d_pthrattrj.U:

           This variable conditionally defines
           pthread_create_joinable.  undef if pthread.h defines
           "PTHREAD_CREATE_JOINABLE".

       "d_oldpthreads"
           From usethreads.U:

           This variable conditionally defines the
           "OLD_PTHREADS_API" symbol, and indicates that Perl
           should be built to use the old draft "POSIX" threads
           "API".  This is only potentially meaningful if
           usethreads is set.

       "d_oldsock"
           From d_socket.U:

           This variable conditionally defines the "OLDSOCKET"
           symbol, which indicates that the "BSD" socket
           interface is based on 4.1c and not 4.2.

       "d_open3"
           From d_open3.U:

           This variable conditionally defines the HAS_OPEN3
           manifest constant, which indicates to the C program



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           that the 3 argument version of the open(2) function is
           available.

       "d_pathconf"
           From d_pathconf.U:

           This variable conditionally defines the "HAS_PATHCONF"
           symbol, which indicates to the C program that the
           pathconf() routine is available to determine file-
           system related limits and options associated with a
           given filename.

       "d_pause"
           From d_pause.U:

           This variable conditionally defines the "HAS_PAUSE"
           symbol, which indicates to the C program that the
           pause() routine is available to suspend a process
           until a signal is received.

       "d_perl_otherlibdirs"
           From otherlibdirs.U:

           This variable conditionally defines
           "PERL_OTHERLIBDIRS", which contains a colon-separated
           set of paths for the perl binary to include in @"INC".
           See also otherlibdirs.

       "d_phostname"
           From d_gethname.U:

           This variable conditionally defines the
           "HAS_PHOSTNAME" symbol, which contains the shell
           command which, when fed to popen(), may be used to
           derive the host name.

       "d_pipe"
           From d_pipe.U:

           This variable conditionally defines the "HAS_PIPE"
           symbol, which indicates to the C program that the
           pipe() routine is available to create an inter-process
           channel.

       "d_poll"
           From d_poll.U:

           This variable conditionally defines the "HAS_POLL"
           symbol, which indicates to the C program that the
           poll() routine is available to poll active file
           descriptors.

       "d_portable"
           From d_portable.U:



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           This variable conditionally defines the "PORTABLE"
           symbol, which indicates to the C program that it
           should not assume that it is running on the machine it
           was compiled on.

       "d_PRId64"
           From quadfio.U:

           This variable conditionally defines the PERL_PRId64
           symbol, which indiciates that stdio has a symbol to
           print 64-bit decimal numbers.

       "d_PRIeldbl"
           From longdblfio.U:

           This variable conditionally defines the PERL_PRIfldbl
           symbol, which indiciates that stdio has a symbol to
           print long doubles.

       "d_PRIEUldbl"
           From longdblfio.U:

           This variable conditionally defines the PERL_PRIfldbl
           symbol, which indiciates that stdio has a symbol to
           print long doubles.  The "U" in the name is to
           separate this from d_PRIeldbl so that even case-blind
           systems can see the difference.

       "d_PRIfldbl"
           From longdblfio.U:

           This variable conditionally defines the PERL_PRIfldbl
           symbol, which indiciates that stdio has a symbol to
           print long doubles.

       "d_PRIFUldbl"
           From longdblfio.U:

           This variable conditionally defines the PERL_PRIfldbl
           symbol, which indiciates that stdio has a symbol to
           print long doubles.  The "U" in the name is to
           separate this from d_PRIfldbl so that even case-blind
           systems can see the difference.

       "d_PRIgldbl"
           From longdblfio.U:

           This variable conditionally defines the PERL_PRIfldbl
           symbol, which indiciates that stdio has a symbol to
           print long doubles.

       "d_PRIGUldbl"
           From longdblfio.U:




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           This variable conditionally defines the PERL_PRIfldbl
           symbol, which indiciates that stdio has a symbol to
           print long doubles.  The "U" in the name is to
           separate this from d_PRIgldbl so that even case-blind
           systems can see the difference.

       "d_PRIi64"
           From quadfio.U:

           This variable conditionally defines the PERL_PRIi64
           symbol, which indiciates that stdio has a symbol to
           print 64-bit decimal numbers.

       "d_printf_format_null"
           From d_attribut.U:

           This variable conditionally defines
           "PRINTF_FORMAT_NULL_OK", which indicates the C
           compiler allows printf-like formats to be null.

       "d_PRIo64"
           From quadfio.U:

           This variable conditionally defines the PERL_PRIo64
           symbol, which indiciates that stdio has a symbol to
           print 64-bit octal numbers.

       "d_PRIu64"
           From quadfio.U:

           This variable conditionally defines the PERL_PRIu64
           symbol, which indiciates that stdio has a symbol to
           print 64-bit unsigned decimal numbers.

       "d_PRIx64"
           From quadfio.U:

           This variable conditionally defines the PERL_PRIx64
           symbol, which indiciates that stdio has a symbol to
           print 64-bit hexadecimal numbers.

       "d_PRIXU64"
           From quadfio.U:

           This variable conditionally defines the PERL_PRIXU64
           symbol, which indiciates that stdio has a symbol to
           print 64-bit hExADECimAl numbers.  The "U" in the name
           is to separate this from d_PRIx64 so that even case-
           blind systems can see the difference.

       "d_procselfexe"
           From d_procselfexe.U:

           Defined if $procselfexe is symlink to the absolute



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           pathname of the executing program.

       "d_pseudofork"
           From d_vfork.U:

           This variable conditionally defines the
           "HAS_PSEUDOFORK" symbol, which indicates that an
           emulation of the fork routine is available.

       "d_pthread_atfork"
           From d_pthread_atfork.U:

           This variable conditionally defines the
           "HAS_PTHREAD_ATFORK" symbol, which indicates to the C
           program that the pthread_atfork() routine is
           available.

       "d_pthread_attr_setscope"
           From d_pthread_attr_ss.U:

           This variable conditionally defines
           "HAS_PTHREAD_ATTR_SETSCOPE" if pthread_attr_setscope()
           is available to set the contention scope attribute of
           a thread attribute object.

       "d_pthread_yield"
           From d_pthread_y.U:

           This variable conditionally defines the
           "HAS_PTHREAD_YIELD" symbol if the pthread_yield
           routine is available to yield the execution of the
           current thread.

       "d_pwage"
           From i_pwd.U:

           This variable conditionally defines "PWAGE", which
           indicates that struct passwd contains pw_age.

       "d_pwchange"
           From i_pwd.U:

           This variable conditionally defines "PWCHANGE", which
           indicates that struct passwd contains pw_change.

       "d_pwclass"
           From i_pwd.U:

           This variable conditionally defines "PWCLASS", which
           indicates that struct passwd contains pw_class.

       "d_pwcomment"
           From i_pwd.U:




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           This variable conditionally defines "PWCOMMENT", which
           indicates that struct passwd contains pw_comment.

       "d_pwexpire"
           From i_pwd.U:

           This variable conditionally defines "PWEXPIRE", which
           indicates that struct passwd contains pw_expire.

       "d_pwgecos"
           From i_pwd.U:

           This variable conditionally defines "PWGECOS", which
           indicates that struct passwd contains pw_gecos.

       "d_pwpasswd"
           From i_pwd.U:

           This variable conditionally defines "PWPASSWD", which
           indicates that struct passwd contains pw_passwd.

       "d_pwquota"
           From i_pwd.U:

           This variable conditionally defines "PWQUOTA", which
           indicates that struct passwd contains pw_quota.

       "d_qgcvt"
           From d_qgcvt.U:

           This variable conditionally defines the "HAS_QGCVT"
           symbol, which indicates to the C program that the
           qgcvt() routine is available.

       "d_quad"
           From quadtype.U:

           This variable, if defined, tells that there's a 64-bit
           integer type, quadtype.

       "d_random_r"
           From d_random_r.U:

           This variable conditionally defines the "HAS_RANDOM_R"
           symbol, which indicates to the C program that the
           random_r() routine is available.

       "d_readdir"
           From d_readdir.U:

           This variable conditionally defines "HAS_READDIR" if
           readdir() is available to read directory entries.





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       "d_readdir64_r"
           From d_readdir64_r.U:

           This variable conditionally defines the
           HAS_READDIR64_R symbol, which indicates to the C
           program that the readdir64_r() routine is available.

       "d_readdir_r"
           From d_readdir_r.U:

           This variable conditionally defines the
           "HAS_READDIR_R" symbol, which indicates to the C
           program that the readdir_r() routine is available.

       "d_readlink"
           From d_readlink.U:

           This variable conditionally defines the "HAS_READLINK"
           symbol, which indicates to the C program that the
           readlink() routine is available to read the value of a
           symbolic link.

       "d_readv"
           From d_readv.U:

           This variable conditionally defines the "HAS_READV"
           symbol, which indicates to the C program that the
           readv() routine is available.

       "d_recvmsg"
           From d_recvmsg.U:

           This variable conditionally defines the "HAS_RECVMSG"
           symbol, which indicates to the C program that the
           recvmsg() routine is available.

       "d_rename"
           From d_rename.U:

           This variable conditionally defines the "HAS_RENAME"
           symbol, which indicates to the C program that the
           rename() routine is available to rename files.

       "d_rewinddir"
           From d_readdir.U:

           This variable conditionally defines "HAS_REWINDDIR" if
           rewinddir() is available.

       "d_rmdir"
           From d_rmdir.U:

           This variable conditionally defines "HAS_RMDIR" if
           rmdir() is available to remove directories.



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       "d_safebcpy"
           From d_safebcpy.U:

           This variable conditionally defines the
           "HAS_SAFE_BCOPY" symbol if the bcopy() routine can do
           overlapping copies.  Normally, you should probably use
           memmove().

       "d_safemcpy"
           From d_safemcpy.U:

           This variable conditionally defines the
           "HAS_SAFE_MEMCPY" symbol if the memcpy() routine can
           do overlapping copies.  For overlapping copies,
           memmove() should be used, if available.

       "d_sanemcmp"
           From d_sanemcmp.U:

           This variable conditionally defines the
           "HAS_SANE_MEMCMP" symbol if the memcpy() routine is
           available and can be used to compare relative
           magnitudes of chars with their high bits set.

       "d_sbrkproto"
           From d_sbrkproto.U:

           This variable conditionally defines the
           "HAS_SBRK_PROTO" symbol, which indicates to the C
           program that the system provides a prototype for the
           sbrk() function.  Otherwise, it is up to the program
           to supply one.

       "d_scalbnl"
           From d_scalbnl.U:

           This variable conditionally defines the "HAS_SCALBNL"
           symbol, which indicates to the C program that the
           scalbnl() routine is available.  If ilogbl is also
           present we can emulate frexpl.

       "d_sched_yield"
           From d_pthread_y.U:

           This variable conditionally defines the
           "HAS_SCHED_YIELD" symbol if the sched_yield routine is
           available to yield the execution of the current
           thread.

       "d_scm_rights"
           From d_socket.U:

           This variable conditionally defines the
           "HAS_SCM_RIGHTS" symbol, which indicates that the



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           "SCM_RIGHTS" is available.  #ifdef is not enough
           because it may be an enum, glibc has been known to do
           this.

       "d_SCNfldbl"
           From longdblfio.U:

           This variable conditionally defines the PERL_PRIfldbl
           symbol, which indiciates that stdio has a symbol to
           scan long doubles.

       "d_seekdir"
           From d_readdir.U:

           This variable conditionally defines "HAS_SEEKDIR" if
           seekdir() is available.

       "d_select"
           From d_select.U:

           This variable conditionally defines "HAS_SELECT" if
           select() is available to select active file
           descriptors. A <sys/time.h> inclusion may be necessary
           for the timeout field.

       "d_sem"
           From d_sem.U:

           This variable conditionally defines the "HAS_SEM"
           symbol, which indicates that the entire sem*(2)
           library is present.

       "d_semctl"
           From d_semctl.U:

           This variable conditionally defines the "HAS_SEMCTL"
           symbol, which indicates to the C program that the
           semctl() routine is available.

       "d_semctl_semid_ds"
           From d_union_semun.U:

           This variable conditionally defines
           "USE_SEMCTL_SEMID_DS", which indicates that struct
           semid_ds * is to be used for semctl "IPC_STAT".

       "d_semctl_semun"
           From d_union_semun.U:

           This variable conditionally defines
           "USE_SEMCTL_SEMUN", which indicates that union semun
           is to be used for semctl "IPC_STAT".





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       "d_semget"
           From d_semget.U:

           This variable conditionally defines the "HAS_SEMGET"
           symbol, which indicates to the C program that the
           semget() routine is available.

       "d_semop"
           From d_semop.U:

           This variable conditionally defines the "HAS_SEMOP"
           symbol, which indicates to the C program that the
           semop() routine is available.

       "d_sendmsg"
           From d_sendmsg.U:

           This variable conditionally defines the "HAS_SENDMSG"
           symbol, which indicates to the C program that the
           sendmsg() routine is available.

       "d_setegid"
           From d_setegid.U:

           This variable conditionally defines the "HAS_SETEGID"
           symbol, which indicates to the C program that the
           setegid() routine is available to change the effective
           gid of the current program.

       "d_seteuid"
           From d_seteuid.U:

           This variable conditionally defines the "HAS_SETEUID"
           symbol, which indicates to the C program that the
           seteuid() routine is available to change the effective
           uid of the current program.

       "d_setgrent"
           From d_setgrent.U:

           This variable conditionally defines the "HAS_SETGRENT"
           symbol, which indicates to the C program that the
           setgrent() routine is available for initializing
           sequential access to the group database.

       "d_setgrent_r"
           From d_setgrent_r.U:

           This variable conditionally defines the
           "HAS_SETGRENT_R" symbol, which indicates to the C
           program that the setgrent_r() routine is available.

       "d_setgrps"
           From d_setgrps.U:



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           This variable conditionally defines the
           "HAS_SETGROUPS" symbol, which indicates to the C
           program that the setgroups() routine is available to
           set the list of process groups.

       "d_sethent"
           From d_sethent.U:

           This variable conditionally defines "HAS_SETHOSTENT"
           if sethostent() is available.

       "d_sethostent_r"
           From d_sethostent_r.U:

           This variable conditionally defines the
           "HAS_SETHOSTENT_R" symbol, which indicates to the C
           program that the sethostent_r() routine is available.

       "d_setitimer"
           From d_setitimer.U:

           This variable conditionally defines the
           "HAS_SETITIMER" symbol, which indicates to the C
           program that the setitimer() routine is available.

       "d_setlinebuf"
           From d_setlnbuf.U:

           This variable conditionally defines the
           "HAS_SETLINEBUF" symbol, which indicates to the C
           program that the setlinebuf() routine is available to
           change stderr or stdout from block-buffered or
           unbuffered to a line-buffered mode.

       "d_setlocale"
           From d_setlocale.U:

           This variable conditionally defines "HAS_SETLOCALE" if
           setlocale() is available to handle locale-specific
           ctype implementations.

       "d_setlocale_r"
           From d_setlocale_r.U:

           This variable conditionally defines the
           "HAS_SETLOCALE_R" symbol, which indicates to the C
           program that the setlocale_r() routine is available.

       "d_setnent"
           From d_setnent.U:

           This variable conditionally defines "HAS_SETNETENT" if
           setnetent() is available.




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       "d_setnetent_r"
           From d_setnetent_r.U:

           This variable conditionally defines the
           "HAS_SETNETENT_R" symbol, which indicates to the C
           program that the setnetent_r() routine is available.

       "d_setpent"
           From d_setpent.U:

           This variable conditionally defines "HAS_SETPROTOENT"
           if setprotoent() is available.

       "d_setpgid"
           From d_setpgid.U:

           This variable conditionally defines the "HAS_SETPGID"
           symbol if the setpgid(pid, gpid) function is available
           to set process group "ID".

       "d_setpgrp"
           From d_setpgrp.U:

           This variable conditionally defines "HAS_SETPGRP" if
           setpgrp() is available to set the current process
           group.

       "d_setpgrp2"
           From d_setpgrp2.U:

           This variable conditionally defines the HAS_SETPGRP2
           symbol, which indicates to the C program that the
           setpgrp2() (as in DG/"UX") routine is available to set
           the current process group.

       "d_setprior"
           From d_setprior.U:

           This variable conditionally defines "HAS_SETPRIORITY"
           if setpriority() is available to set a process's
           priority.

       "d_setproctitle"
           From d_setproctitle.U:

           This variable conditionally defines the
           "HAS_SETPROCTITLE" symbol, which indicates to the C
           program that the setproctitle() routine is available.

       "d_setprotoent_r"
           From d_setprotoent_r.U:

           This variable conditionally defines the
           "HAS_SETPROTOENT_R" symbol, which indicates to the C



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           program that the setprotoent_r() routine is available.

       "d_setpwent"
           From d_setpwent.U:

           This variable conditionally defines the "HAS_SETPWENT"
           symbol, which indicates to the C program that the
           setpwent() routine is available for initializing
           sequential access to the passwd database.

       "d_setpwent_r"
           From d_setpwent_r.U:

           This variable conditionally defines the
           "HAS_SETPWENT_R" symbol, which indicates to the C
           program that the setpwent_r() routine is available.

       "d_setregid"
           From d_setregid.U:

           This variable conditionally defines "HAS_SETREGID" if
           setregid() is available to change the real and
           effective gid of the current process.

       "d_setresgid"
           From d_setregid.U:

           This variable conditionally defines "HAS_SETRESGID" if
           setresgid() is available to change the real, effective
           and saved gid of the current process.

       "d_setresuid"
           From d_setreuid.U:

           This variable conditionally defines "HAS_SETREUID" if
           setresuid() is available to change the real, effective
           and saved uid of the current process.

       "d_setreuid"
           From d_setreuid.U:

           This variable conditionally defines "HAS_SETREUID" if
           setreuid() is available to change the real and
           effective uid of the current process.

       "d_setrgid"
           From d_setrgid.U:

           This variable conditionally defines the "HAS_SETRGID"
           symbol, which indicates to the C program that the
           setrgid() routine is available to change the real gid
           of the current program.





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       "d_setruid"
           From d_setruid.U:

           This variable conditionally defines the "HAS_SETRUID"
           symbol, which indicates to the C program that the
           setruid() routine is available to change the real uid
           of the current program.

       "d_setsent"
           From d_setsent.U:

           This variable conditionally defines "HAS_SETSERVENT"
           if setservent() is available.

       "d_setservent_r"
           From d_setservent_r.U:

           This variable conditionally defines the
           "HAS_SETSERVENT_R" symbol, which indicates to the C
           program that the setservent_r() routine is available.

       "d_setsid"
           From d_setsid.U:

           This variable conditionally defines "HAS_SETSID" if
           setsid() is available to set the process group "ID".

       "d_setvbuf"
           From d_setvbuf.U:

           This variable conditionally defines the "HAS_SETVBUF"
           symbol, which indicates to the C program that the
           setvbuf() routine is available to change buffering on
           an open stdio stream.

       "d_sfio"
           From d_sfio.U:

           This variable conditionally defines the "USE_SFIO"
           symbol, and indicates whether sfio is available (and
           should be used).

       "d_shm"
           From d_shm.U:

           This variable conditionally defines the "HAS_SHM"
           symbol, which indicates that the entire shm*(2)
           library is present.

       "d_shmat"
           From d_shmat.U:

           This variable conditionally defines the "HAS_SHMAT"
           symbol, which indicates to the C program that the



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           shmat() routine is available.

       "d_shmatprototype"
           From d_shmat.U:

           This variable conditionally defines the
           "HAS_SHMAT_PROTOTYPE" symbol, which indicates that
           sys/shm.h has a prototype for shmat.

       "d_shmctl"
           From d_shmctl.U:

           This variable conditionally defines the "HAS_SHMCTL"
           symbol, which indicates to the C program that the
           shmctl() routine is available.

       "d_shmdt"
           From d_shmdt.U:

           This variable conditionally defines the "HAS_SHMDT"
           symbol, which indicates to the C program that the
           shmdt() routine is available.

       "d_shmget"
           From d_shmget.U:

           This variable conditionally defines the "HAS_SHMGET"
           symbol, which indicates to the C program that the
           shmget() routine is available.

       "d_sigaction"
           From d_sigaction.U:

           This variable conditionally defines the
           "HAS_SIGACTION" symbol, which indicates that the Vr4
           sigaction() routine is available.

       "d_signbit"
           From d_signbit.U:

           This variable conditionally defines the "HAS_SIGNBIT"
           symbol, which indicates to the C program that the
           signbit() routine is available and safe to use with
           perl's intern "NV" type.

       "d_sigprocmask"
           From d_sigprocmask.U:

           This variable conditionally defines "HAS_SIGPROCMASK"
           if sigprocmask() is available to examine or change the
           signal mask of the calling process.

       "d_sigsetjmp"
           From d_sigsetjmp.U:



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           This variable conditionally defines the
           "HAS_SIGSETJMP" symbol, which indicates that the
           sigsetjmp() routine is available to call setjmp() and
           optionally save the process's signal mask.

       "d_sitearch"
           From sitearch.U:

           This variable conditionally defines "SITEARCH" to hold
           the pathname of architecture-dependent library files
           for $package.  If $sitearch is the same as $archlib,
           then this is set to undef.

       "d_snprintf"
           From d_snprintf.U:

           This variable conditionally defines the "HAS_SNPRINTF"
           symbol, which indicates to the C program that the
           snprintf () library function is available.

       "d_sockatmark"
           From d_sockatmark.U:

           This variable conditionally defines the
           "HAS_SOCKATMARK" symbol, which indicates to the C
           program that the sockatmark() routine is available.

       "d_sockatmarkproto"
           From d_sockatmarkproto.U:

           This variable conditionally defines the
           "HAS_SOCKATMARK_PROTO" symbol, which indicates to the
           C program that the system provides a prototype for the
           sockatmark() function.  Otherwise, it is up to the
           program to supply one.

       "d_socket"
           From d_socket.U:

           This variable conditionally defines "HAS_SOCKET",
           which indicates that the "BSD" socket interface is
           supported.

       "d_socklen_t"
           From d_socklen_t.U:

           This symbol will be defined if the C compiler supports
           socklen_t.

       "d_sockpair"
           From d_socket.U:

           This variable conditionally defines the
           "HAS_SOCKETPAIR" symbol, which indicates that the



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           "BSD" socketpair() is supported.

       "d_socks5_init"
           From d_socks5_init.U:

           This variable conditionally defines the
           HAS_SOCKS5_INIT symbol, which indicates to the C
           program that the socks5_init() routine is available.

       "d_sprintf_returns_strlen"
           From d_sprintf_len.U:

           This variable defines whether sprintf returns the
           length of the string (as per the "ANSI" spec). Some C
           libraries retain compatibility with pre-"ANSI" C and
           return a pointer to the passed in buffer; for these
           this variable will be undef.

       "d_sqrtl"
           From d_sqrtl.U:

           This variable conditionally defines the "HAS_SQRTL"
           symbol, which indicates to the C program that the
           sqrtl() routine is available.

       "d_srand48_r"
           From d_srand48_r.U:

           This variable conditionally defines the HAS_SRAND48_R
           symbol, which indicates to the C program that the
           srand48_r() routine is available.

       "d_srandom_r"
           From d_srandom_r.U:

           This variable conditionally defines the
           "HAS_SRANDOM_R" symbol, which indicates to the C
           program that the srandom_r() routine is available.

       "d_sresgproto"
           From d_sresgproto.U:

           This variable conditionally defines the
           "HAS_SETRESGID_PROTO" symbol, which indicates to the C
           program that the system provides a prototype for the
           setresgid() function.  Otherwise, it is up to the
           program to supply one.

       "d_sresuproto"
           From d_sresuproto.U:

           This variable conditionally defines the
           "HAS_SETRESUID_PROTO" symbol, which indicates to the C
           program that the system provides a prototype for the



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           setresuid() function.  Otherwise, it is up to the
           program to supply one.

       "d_statblks"
           From d_statblks.U:

           This variable conditionally defines "USE_STAT_BLOCKS"
           if this system has a stat structure declaring
           st_blksize and st_blocks.

       "d_statfs_f_flags"
           From d_statfs_f_flags.U:

           This variable conditionally defines the
           "HAS_STRUCT_STATFS_F_FLAGS" symbol, which indicates to
           struct statfs from has f_flags member.  This kind of
           struct statfs is coming from sys/mount.h ("BSD"), not
           from sys/statfs.h ("SYSV").

       "d_statfs_s"
           From d_statfs_s.U:

           This variable conditionally defines the
           "HAS_STRUCT_STATFS" symbol, which indicates that the
           struct statfs is supported.

       "d_statvfs"
           From d_statvfs.U:

           This variable conditionally defines the "HAS_STATVFS"
           symbol, which indicates to the C program that the
           statvfs() routine is available.

       "d_stdio_cnt_lval"
           From d_stdstdio.U:

           This variable conditionally defines "STDIO_CNT_LVALUE"
           if the "FILE_cnt" macro can be used as an lvalue.

       "d_stdio_ptr_lval"
           From d_stdstdio.U:

           This variable conditionally defines "STDIO_PTR_LVALUE"
           if the "FILE_ptr" macro can be used as an lvalue.

       "d_stdio_ptr_lval_nochange_cnt"
           From d_stdstdio.U:

           This symbol is defined if using the "FILE_ptr" macro
           as an lvalue to increase the pointer by n leaves
           File_cnt(fp) unchanged.

       "d_stdio_ptr_lval_sets_cnt"
           From d_stdstdio.U:



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           This symbol is defined if using the "FILE_ptr" macro
           as an lvalue to increase the pointer by n has the side
           effect of decreasing the value of File_cnt(fp) by n.

       "d_stdio_stream_array"
           From stdio_streams.U:

           This variable tells whether there is an array holding
           the stdio streams.

       "d_stdiobase"
           From d_stdstdio.U:

           This variable conditionally defines "USE_STDIO_BASE"
           if this system has a "FILE" structure declaring a
           usable _base field (or equivalent) in stdio.h.

       "d_stdstdio"
           From d_stdstdio.U:

           This variable conditionally defines "USE_STDIO_PTR" if
           this system has a "FILE" structure declaring usable
           _ptr and _cnt fields (or equivalent) in stdio.h.

       "d_strchr"
           From d_strchr.U:

           This variable conditionally defines "HAS_STRCHR" if
           strchr() and strrchr() are available for string
           searching.

       "d_strcoll"
           From d_strcoll.U:

           This variable conditionally defines "HAS_STRCOLL" if
           strcoll() is available to compare strings using
           collating information.

       "d_strctcpy"
           From d_strctcpy.U:

           This variable conditionally defines the
           "USE_STRUCT_COPY" symbol, which indicates to the C
           program that this C compiler knows how to copy
           structures.

       "d_strerrm"
           From d_strerror.U:

           This variable holds what Strerrr is defined as to
           translate an error code condition into an error
           message string. It could be "strerror" or a more
           "complex" macro emulating strrror with sys_errlist[],
           or the "unknown" string when both strerror and



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           sys_errlist are missing.

       "d_strerror"
           From d_strerror.U:

           This variable conditionally defines "HAS_STRERROR" if
           strerror() is available to translate error numbers to
           strings.

       "d_strerror_r"
           From d_strerror_r.U:

           This variable conditionally defines the
           "HAS_STRERROR_R" symbol, which indicates to the C
           program that the strerror_r() routine is available.

       "d_strftime"
           From d_strftime.U:

           This variable conditionally defines the "HAS_STRFTIME"
           symbol, which indicates to the C program that the
           strftime() routine is available.

       "d_strlcat"
           From d_strlcat.U:

           This variable conditionally defines the "HAS_STRLCAT"
           symbol, which indicates to the C program that the
           strlcat () routine is available.

       "d_strlcpy"
           From d_strlcpy.U:

           This variable conditionally defines the "HAS_STRLCPY"
           symbol, which indicates to the C program that the
           strlcpy () routine is available.

       "d_strtod"
           From d_strtod.U:

           This variable conditionally defines the "HAS_STRTOD"
           symbol, which indicates to the C program that the
           strtod() routine is available to provide better
           numeric string conversion than atof().

       "d_strtol"
           From d_strtol.U:

           This variable conditionally defines the "HAS_STRTOL"
           symbol, which indicates to the C program that the
           strtol() routine is available to provide better
           numeric string conversion than atoi() and friends.





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       "d_strtold"
           From d_strtold.U:

           This variable conditionally defines the "HAS_STRTOLD"
           symbol, which indicates to the C program that the
           strtold() routine is available.

       "d_strtoll"
           From d_strtoll.U:

           This variable conditionally defines the "HAS_STRTOLL"
           symbol, which indicates to the C program that the
           strtoll() routine is available.

       "d_strtoq"
           From d_strtoq.U:

           This variable conditionally defines the "HAS_STRTOQ"
           symbol, which indicates to the C program that the
           strtoq() routine is available.

       "d_strtoul"
           From d_strtoul.U:

           This variable conditionally defines the "HAS_STRTOUL"
           symbol, which indicates to the C program that the
           strtoul() routine is available to provide conversion
           of strings to unsigned long.

       "d_strtoull"
           From d_strtoull.U:

           This variable conditionally defines the "HAS_STRTOULL"
           symbol, which indicates to the C program that the
           strtoull() routine is available.

       "d_strtouq"
           From d_strtouq.U:

           This variable conditionally defines the "HAS_STRTOUQ"
           symbol, which indicates to the C program that the
           strtouq() routine is available.

       "d_strxfrm"
           From d_strxfrm.U:

           This variable conditionally defines "HAS_STRXFRM" if
           strxfrm() is available to transform strings.

       "d_suidsafe"
           From d_dosuid.U:

           This variable conditionally defines
           "SETUID_SCRIPTS_ARE_SECURE_NOW" if setuid scripts can



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           be secure.  This test looks in /dev/fd/.

       "d_symlink"
           From d_symlink.U:

           This variable conditionally defines the "HAS_SYMLINK"
           symbol, which indicates to the C program that the
           symlink() routine is available to create symbolic
           links.

       "d_syscall"
           From d_syscall.U:

           This variable conditionally defines "HAS_SYSCALL" if
           syscall() is available call arbitrary system calls.

       "d_syscallproto"
           From d_syscallproto.U:

           This variable conditionally defines the
           "HAS_SYSCALL_PROTO" symbol, which indicates to the C
           program that the system provides a prototype for the
           syscall() function.  Otherwise, it is up to the
           program to supply one.

       "d_sysconf"
           From d_sysconf.U:

           This variable conditionally defines the "HAS_SYSCONF"
           symbol, which indicates to the C program that the
           sysconf() routine is available to determine system
           related limits and options.

       "d_sysernlst"
           From d_strerror.U:

           This variable conditionally defines
           "HAS_SYS_ERRNOLIST" if sys_errnolist[] is available to
           translate error numbers to the symbolic name.

       "d_syserrlst"
           From d_strerror.U:

           This variable conditionally defines "HAS_SYS_ERRLIST"
           if sys_errlist[] is available to translate error
           numbers to strings.

       "d_system"
           From d_system.U:

           This variable conditionally defines "HAS_SYSTEM" if
           system() is available to issue a shell command.





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       "d_tcgetpgrp"
           From d_tcgtpgrp.U:

           This variable conditionally defines the
           "HAS_TCGETPGRP" symbol, which indicates to the C
           program that the tcgetpgrp() routine is available.  to
           get foreground process group "ID".

       "d_tcsetpgrp"
           From d_tcstpgrp.U:

           This variable conditionally defines the
           "HAS_TCSETPGRP" symbol, which indicates to the C
           program that the tcsetpgrp() routine is available to
           set foreground process group "ID".

       "d_telldir"
           From d_readdir.U:

           This variable conditionally defines "HAS_TELLDIR" if
           telldir() is available.

       "d_telldirproto"
           From d_telldirproto.U:

           This variable conditionally defines the
           "HAS_TELLDIR_PROTO" symbol, which indicates to the C
           program that the system provides a prototype for the
           telldir() function.  Otherwise, it is up to the
           program to supply one.

       "d_time"
           From d_time.U:

           This variable conditionally defines the "HAS_TIME"
           symbol, which indicates that the time() routine
           exists.  The time() routine is normaly provided on
           "UNIX" systems.

       "d_timegm"
           From d_timegm.U:

           This variable conditionally defines the "HAS_TIMEGM"
           symbol, which indicates to the C program that the
           timegm () routine is available.

       "d_times"
           From d_times.U:

           This variable conditionally defines the "HAS_TIMES"
           symbol, which indicates that the times() routine
           exists.  The times() routine is normaly provided on
           "UNIX" systems. You may have to include <sys/times.h>.




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       "d_tm_tm_gmtoff"
           From i_time.U:

           This variable conditionally defines
           "HAS_TM_TM_GMTOFF", which indicates indicates to the C
           program that the struct tm has the tm_gmtoff field.

       "d_tm_tm_zone"
           From i_time.U:

           This variable conditionally defines "HAS_TM_TM_ZONE",
           which indicates indicates to the C program that the
           struct tm has the tm_zone field.

       "d_tmpnam_r"
           From d_tmpnam_r.U:

           This variable conditionally defines the "HAS_TMPNAM_R"
           symbol, which indicates to the C program that the
           tmpnam_r() routine is available.

       "d_truncate"
           From d_truncate.U:

           This variable conditionally defines "HAS_TRUNCATE" if
           truncate() is available to truncate files.

       "d_ttyname_r"
           From d_ttyname_r.U:

           This variable conditionally defines the
           "HAS_TTYNAME_R" symbol, which indicates to the C
           program that the ttyname_r() routine is available.

       "d_tzname"
           From d_tzname.U:

           This variable conditionally defines "HAS_TZNAME" if
           tzname[] is available to access timezone names.

       "d_u32align"
           From d_u32align.U:

           This variable tells whether you must access character
           data through U32-aligned pointers.

       "d_ualarm"
           From d_ualarm.U:

           This variable conditionally defines the "HAS_UALARM"
           symbol, which indicates to the C program that the
           ualarm() routine is available.





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       "d_umask"
           From d_umask.U:

           This variable conditionally defines the "HAS_UMASK"
           symbol, which indicates to the C program that the
           umask() routine is available.  to set and get the
           value of the file creation mask.

       "d_uname"
           From d_gethname.U:

           This variable conditionally defines the "HAS_UNAME"
           symbol, which indicates to the C program that the
           uname() routine may be used to derive the host name.

       "d_union_semun"
           From d_union_semun.U:

           This variable conditionally defines "HAS_UNION_SEMUN"
           if the union semun is defined by including
           <sys/sem.h>.

       "d_unordered"
           From d_unordered.U:

           This variable conditionally defines the
           "HAS_UNORDERED" symbol, which indicates to the C
           program that the unordered() routine is available.

       "d_unsetenv"
           From d_unsetenv.U:

           This variable conditionally defines the "HAS_UNSETENV"
           symbol, which indicates to the C program that the
           unsetenv () routine is available.

       "d_usleep"
           From d_usleep.U:

           This variable conditionally defines "HAS_USLEEP" if
           usleep() is available to do high granularity sleeps.

       "d_usleepproto"
           From d_usleepproto.U:

           This variable conditionally defines the
           "HAS_USLEEP_PROTO" symbol, which indicates to the C
           program that the system provides a prototype for the
           usleep() function.  Otherwise, it is up to the program
           to supply one.

       "d_ustat"
           From d_ustat.U:




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           This variable conditionally defines "HAS_USTAT" if
           ustat() is available to query file system statistics
           by dev_t.

       "d_vendorarch"
           From vendorarch.U:

           This variable conditionally defined "PERL_VENDORARCH".

       "d_vendorbin"
           From vendorbin.U:

           This variable conditionally defines "PERL_VENDORBIN".

       "d_vendorlib"
           From vendorlib.U:

           This variable conditionally defines "PERL_VENDORLIB".

       "d_vendorscript"
           From vendorscript.U:

           This variable conditionally defines
           "PERL_VENDORSCRIPT".

       "d_vfork"
           From d_vfork.U:

           This variable conditionally defines the "HAS_VFORK"
           symbol, which indicates the vfork() routine is
           available.

       "d_void_closedir"
           From d_closedir.U:

           This variable conditionally defines "VOID_CLOSEDIR" if
           closedir() does not return a value.

       "d_voidsig"
           From d_voidsig.U:

           This variable conditionally defines "VOIDSIG" if this
           system declares "void (*signal(...))()" in signal.h.
           The old way was to declare it as "int
           (*signal(...))()".

       "d_voidtty"
           From i_sysioctl.U:

           This variable conditionally defines "USE_IOCNOTTY" to
           indicate that the ioctl() call with "TIOCNOTTY" should
           be used to void tty association.  Otherwise (on "USG"
           probably), it is enough to close the standard file
           decriptors and do a setpgrp().



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       "d_volatile"
           From d_volatile.U:

           This variable conditionally defines the "HASVOLATILE"
           symbol, which indicates to the C program that this C
           compiler knows about the volatile declaration.

       "d_vprintf"
           From d_vprintf.U:

           This variable conditionally defines the "HAS_VPRINTF"
           symbol, which indicates to the C program that the
           vprintf() routine is available to printf with a
           pointer to an argument list.

       "d_vsnprintf"
           From d_snprintf.U:

           This variable conditionally defines the
           "HAS_VSNPRINTF" symbol, which indicates to the C
           program that the vsnprintf () library function is
           available.

       "d_wait4"
           From d_wait4.U:

           This variable conditionally defines the HAS_WAIT4
           symbol, which indicates the wait4() routine is
           available.

       "d_waitpid"
           From d_waitpid.U:

           This variable conditionally defines "HAS_WAITPID" if
           waitpid() is available to wait for child process.

       "d_wcstombs"
           From d_wcstombs.U:

           This variable conditionally defines the "HAS_WCSTOMBS"
           symbol, which indicates to the C program that the
           wcstombs() routine is available to convert wide
           character strings to multibyte strings.

       "d_wctomb"
           From d_wctomb.U:

           This variable conditionally defines the "HAS_WCTOMB"
           symbol, which indicates to the C program that the
           wctomb() routine is available to convert a wide
           character to a multibyte.

       "d_writev"
           From d_writev.U:



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           This variable conditionally defines the "HAS_WRITEV"
           symbol, which indicates to the C program that the
           writev() routine is available.

       "d_xenix"
           From Guess.U:

           This variable conditionally defines the symbol
           "XENIX", which alerts the C program that it runs under
           Xenix.

       "date"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the date
           program.  After Configure runs, the value is reset to
           a plain "date" and is not useful.

       "db_hashtype"
           From i_db.U:

           This variable contains the type of the hash structure
           element in the <db.h> header file.  In older versions
           of "DB", it was int, while in newer ones it is
           u_int32_t.

       "db_prefixtype"
           From i_db.U:

           This variable contains the type of the prefix
           structure element in the <db.h> header file.  In older
           versions of "DB", it was int, while in newer ones it
           is size_t.

       "db_version_major"
           From i_db.U:

           This variable contains the major version number of
           Berkeley "DB" found in the <db.h> header file.

       "db_version_minor"
           From i_db.U:

           This variable contains the minor version number of
           Berkeley "DB" found in the <db.h> header file.  For
           "DB" version 1 this is always 0.

       "db_version_patch"
           From i_db.U:

           This variable contains the patch version number of
           Berkeley "DB" found in the <db.h> header file.  For
           "DB" version 1 this is always 0.



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       "defvoidused"
           From voidflags.U:

           This variable contains the default value of the
           "VOIDUSED" symbol (15).

       "direntrytype"
           From i_dirent.U:

           This symbol is set to "struct direct" or "struct
           dirent" depending on whether dirent is available or
           not. You should use this pseudo type to portably
           declare your directory entries.

       "dlext"
           From dlext.U:

           This variable contains the extension that is to be
           used for the dynamically loaded modules that perl
           generaties.

       "dlsrc"
           From dlsrc.U:

           This variable contains the name of the dynamic loading
           file that will be used with the package.

       "doublesize"
           From doublesize.U:

           This variable contains the value of the "DOUBLESIZE"
           symbol, which indicates to the C program how many
           bytes there are in a double.

       "drand01"
           From randfunc.U:

           Indicates the macro to be used to generate normalized
           random numbers.  Uses randfunc, often divided by
           (double) (((unsigned long) 1 << randbits)) in order to
           normalize the result.  In C programs, the macro
           "Drand01" is mapped to drand01.

       "drand48_r_proto"
           From d_drand48_r.U:

           This variable encodes the prototype of drand48_r.  It
           is zero if d_drand48_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_drand48_r is defined.

       "dtrace"
           From usedtrace.U:




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           This variable holds the location of the dtrace
           executable.

       "dynamic_ext"
           From Extensions.U:

           This variable holds a list of "XS" extension files we
           want to link dynamically into the package.  It is used
           by Makefile.

   e
       "eagain"
           From nblock_io.U:

           This variable bears the symbolic errno code set by
           read() when no data is present on the file and non-
           blocking I/O was enabled (otherwise, read() blocks
           naturally).

       "ebcdic"
           From ebcdic.U:

           This variable conditionally defines "EBCDIC" if this
           system uses "EBCDIC" encoding.  Among other things,
           this means that the character ranges are not
           contiguous.  See trnl.U

       "echo"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the echo
           program.  After Configure runs, the value is reset to
           a plain "echo" and is not useful.

       "egrep"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the egrep
           program.  After Configure runs, the value is reset to
           a plain "egrep" and is not useful.

       "emacs"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "endgrent_r_proto"
           From d_endgrent_r.U:

           This variable encodes the prototype of endgrent_r.  It
           is zero if d_endgrent_r is undef, and one of the



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           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_endgrent_r is defined.

       "endhostent_r_proto"
           From d_endhostent_r.U:

           This variable encodes the prototype of endhostent_r.
           It is zero if d_endhostent_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_endhostent_r is defined.

       "endnetent_r_proto"
           From d_endnetent_r.U:

           This variable encodes the prototype of endnetent_r.
           It is zero if d_endnetent_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_endnetent_r is defined.

       "endprotoent_r_proto"
           From d_endprotoent_r.U:

           This variable encodes the prototype of endprotoent_r.
           It is zero if d_endprotoent_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_endprotoent_r is defined.

       "endpwent_r_proto"
           From d_endpwent_r.U:

           This variable encodes the prototype of endpwent_r.  It
           is zero if d_endpwent_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_endpwent_r is defined.

       "endservent_r_proto"
           From d_endservent_r.U:

           This variable encodes the prototype of endservent_r.
           It is zero if d_endservent_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_endservent_r is defined.

       "eunicefix"
           From Init.U:

           When running under Eunice this variable contains a
           command which will convert a shell script to the
           proper form of text file for it to be executable by
           the shell.  On other systems it is a no-op.

       "exe_ext"
           From Unix.U:




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           This is an old synonym for _exe.

       "expr"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the expr
           program.  After Configure runs, the value is reset to
           a plain "expr" and is not useful.

       "extensions"
           From Extensions.U:

           This variable holds a list of all extension files
           (both "XS" and non-xs linked into the package.  It is
           propagated to Config.pm and is typically used to test
           whether a particular extesion is available.

       "extern_C"
           From Csym.U:

           "ANSI" C requires "extern" where C++ requires 'extern
           "C"'. This variable can be used in Configure to do the
           right thing.

       "extras"
           From Extras.U:

           This variable holds a list of extra modules to
           install.

   f
       "fflushall"
           From fflushall.U:

           This symbol, if defined, tells that to flush all
           pending stdio output one must loop through all the
           stdio file handles stored in an array and fflush them.
           Note that if fflushNULL is defined, fflushall will not
           even be probed for and will be left undefined.

       "fflushNULL"
           From fflushall.U:

           This symbol, if defined, tells that fflush("NULL")
           does flush all pending stdio output.

       "find"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.





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       "firstmakefile"
           From Unix.U:

           This variable defines the first file searched by make.
           On unix, it is makefile (then Makefile).  On case-
           insensitive systems, it might be something else.  This
           is only used to deal with convoluted make depend
           tricks.

       "flex"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "fpossize"
           From fpossize.U:

           This variable contains the size of a fpostype in
           bytes.

       "fpostype"
           From fpostype.U:

           This variable defines Fpos_t to be something like
           fpos_t, long, uint, or whatever type is used to
           declare file positions in libc.

       "freetype"
           From mallocsrc.U:

           This variable contains the return type of free().  It
           is usually void, but occasionally int.

       "from"
           From Cross.U:

           This variable contains the command used by Configure
           to copy files from the target host.  Useful and
           available only during Perl build.  The string ":" if
           not cross-compiling.

       "full_ar"
           From Loc_ar.U:

           This variable contains the full pathname to "ar",
           whether or not the user has specified "portability".
           This is only used in the Makefile.SH.

       "full_csh"
           From d_csh.U:

           This variable contains the full pathname to "csh",
           whether or not the user has specified "portability".



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           This is only used in the compiled C program, and we
           assume that all systems which can share this
           executable will have the same full pathname to csh.

       "full_sed"
           From Loc_sed.U:

           This variable contains the full pathname to "sed",
           whether or not the user has specified "portability".
           This is only used in the compiled C program, and we
           assume that all systems which can share this
           executable will have the same full pathname to sed.

   g
       "gccansipedantic"
           From gccvers.U:

           If "GNU" cc (gcc) is used, this variable will enable
           (if set) the -ansi and -pedantic ccflags for building
           core files (through cflags script). (See
           Porting/pumpkin.pod for full description).

       "gccosandvers"
           From gccvers.U:

           If "GNU" cc (gcc) is used, this variable holds the
           operating system and version used to compile gcc.  It
           is set to '' if not gcc, or if nothing useful can be
           parsed as the os version.

       "gccversion"
           From gccvers.U:

           If "GNU" cc (gcc) is used, this variable holds 1 or 2
           to indicate whether the compiler is version 1 or 2.
           This is used in setting some of the default cflags.
           It is set to '' if not gcc.

       "getgrent_r_proto"
           From d_getgrent_r.U:

           This variable encodes the prototype of getgrent_r.  It
           is zero if d_getgrent_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_getgrent_r is defined.

       "getgrgid_r_proto"
           From d_getgrgid_r.U:

           This variable encodes the prototype of getgrgid_r.  It
           is zero if d_getgrgid_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_getgrgid_r is defined.




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       "getgrnam_r_proto"
           From d_getgrnam_r.U:

           This variable encodes the prototype of getgrnam_r.  It
           is zero if d_getgrnam_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_getgrnam_r is defined.

       "gethostbyaddr_r_proto"
           From d_gethostbyaddr_r.U:

           This variable encodes the prototype of
           gethostbyaddr_r.  It is zero if d_gethostbyaddr_r is
           undef, and one of the "REENTRANT_PROTO_T_ABC" macros
           of reentr.h if d_gethostbyaddr_r is defined.

       "gethostbyname_r_proto"
           From d_gethostbyname_r.U:

           This variable encodes the prototype of
           gethostbyname_r.  It is zero if d_gethostbyname_r is
           undef, and one of the "REENTRANT_PROTO_T_ABC" macros
           of reentr.h if d_gethostbyname_r is defined.

       "gethostent_r_proto"
           From d_gethostent_r.U:

           This variable encodes the prototype of gethostent_r.
           It is zero if d_gethostent_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_gethostent_r is defined.

       "getlogin_r_proto"
           From d_getlogin_r.U:

           This variable encodes the prototype of getlogin_r.  It
           is zero if d_getlogin_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_getlogin_r is defined.

       "getnetbyaddr_r_proto"
           From d_getnetbyaddr_r.U:

           This variable encodes the prototype of getnetbyaddr_r.
           It is zero if d_getnetbyaddr_r is undef, and one of
           the "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_getnetbyaddr_r is defined.

       "getnetbyname_r_proto"
           From d_getnetbyname_r.U:

           This variable encodes the prototype of getnetbyname_r.
           It is zero if d_getnetbyname_r is undef, and one of
           the "REENTRANT_PROTO_T_ABC" macros of reentr.h if



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           d_getnetbyname_r is defined.

       "getnetent_r_proto"
           From d_getnetent_r.U:

           This variable encodes the prototype of getnetent_r.
           It is zero if d_getnetent_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_getnetent_r is defined.

       "getprotobyname_r_proto"
           From d_getprotobyname_r.U:

           This variable encodes the prototype of
           getprotobyname_r.  It is zero if d_getprotobyname_r is
           undef, and one of the "REENTRANT_PROTO_T_ABC" macros
           of reentr.h if d_getprotobyname_r is defined.

       "getprotobynumber_r_proto"
           From d_getprotobynumber_r.U:

           This variable encodes the prototype of
           getprotobynumber_r.  It is zero if
           d_getprotobynumber_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_getprotobynumber_r is defined.

       "getprotoent_r_proto"
           From d_getprotoent_r.U:

           This variable encodes the prototype of getprotoent_r.
           It is zero if d_getprotoent_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_getprotoent_r is defined.

       "getpwent_r_proto"
           From d_getpwent_r.U:

           This variable encodes the prototype of getpwent_r.  It
           is zero if d_getpwent_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_getpwent_r is defined.

       "getpwnam_r_proto"
           From d_getpwnam_r.U:

           This variable encodes the prototype of getpwnam_r.  It
           is zero if d_getpwnam_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_getpwnam_r is defined.

       "getpwuid_r_proto"
           From d_getpwuid_r.U:




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           This variable encodes the prototype of getpwuid_r.  It
           is zero if d_getpwuid_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_getpwuid_r is defined.

       "getservbyname_r_proto"
           From d_getservbyname_r.U:

           This variable encodes the prototype of
           getservbyname_r.  It is zero if d_getservbyname_r is
           undef, and one of the "REENTRANT_PROTO_T_ABC" macros
           of reentr.h if d_getservbyname_r is defined.

       "getservbyport_r_proto"
           From d_getservbyport_r.U:

           This variable encodes the prototype of
           getservbyport_r.  It is zero if d_getservbyport_r is
           undef, and one of the "REENTRANT_PROTO_T_ABC" macros
           of reentr.h if d_getservbyport_r is defined.

       "getservent_r_proto"
           From d_getservent_r.U:

           This variable encodes the prototype of getservent_r.
           It is zero if d_getservent_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_getservent_r is defined.

       "getspnam_r_proto"
           From d_getspnam_r.U:

           This variable encodes the prototype of getspnam_r.  It
           is zero if d_getspnam_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_getspnam_r is defined.

       "gidformat"
           From gidf.U:

           This variable contains the format string used for
           printing a Gid_t.

       "gidsign"
           From gidsign.U:

           This variable contains the signedness of a gidtype.  1
           for unsigned, -1 for signed.

       "gidsize"
           From gidsize.U:

           This variable contains the size of a gidtype in bytes.




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       "gidtype"
           From gidtype.U:

           This variable defines Gid_t to be something like
           gid_t, int, ushort, or whatever type is used to
           declare the return type of getgid().  Typically, it is
           the type of group ids in the kernel.

       "glibpth"
           From libpth.U:

           This variable holds the general path (space-separated)
           used to find libraries.  It may contain directories
           that do not exist on this platform, libpth is the
           cleaned-up version.

       "gmake"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the gmake
           program.  After Configure runs, the value is reset to
           a plain "gmake" and is not useful.

       "gmtime_r_proto"
           From d_gmtime_r.U:

           This variable encodes the prototype of gmtime_r.  It
           is zero if d_gmtime_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_gmtime_r is defined.

       "gnulibc_version"
           From d_gnulibc.U:

           This variable contains the version number of the "GNU"
           C library.  It is usually something like 2.2.5.  It is
           a plain '' if this is not the "GNU" C library, or if
           the version is unknown.

       "grep"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the grep
           program.  After Configure runs, the value is reset to
           a plain "grep" and is not useful.

       "groupcat"
           From nis.U:

           This variable contains a command that produces the
           text of the /etc/group file.  This is normally "cat
           /etc/group", but can be "ypcat group" when "NIS" is



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           used.  On some systems, such as os390, there may be no
           equivalent command, in which case this variable is
           unset.

       "groupstype"
           From groupstype.U:

           This variable defines Groups_t to be something like
           gid_t, int, ushort, or whatever type is used for the
           second argument to getgroups() and setgroups().
           Usually, this is the same as gidtype (gid_t), but
           sometimes it isn't.

       "gzip"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the gzip
           program.  After Configure runs, the value is reset to
           a plain "gzip" and is not useful.

   h
       "h_fcntl"
           From h_fcntl.U:

           This is variable gets set in various places to tell
           i_fcntl that <fcntl.h> should be included.

       "h_sysfile"
           From h_sysfile.U:

           This is variable gets set in various places to tell
           i_sys_file that <sys/file.h> should be included.

       "hint"
           From Oldconfig.U:

           Gives the type of hints used for previous answers. May
           be one of "default", "recommended" or "previous".

       "hostcat"
           From nis.U:

           This variable contains a command that produces the
           text of the /etc/hosts file.  This is normally "cat
           /etc/hosts", but can be "ypcat hosts" when "NIS" is
           used.  On some systems, such as os390, there may be no
           equivalent command, in which case this variable is
           unset.

       "html1dir"
           From html1dir.U:

           This variable contains the name of the directory in



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           which html source pages are to be put.  This directory
           is for pages that describe whole programs, not
           libraries or modules.  It is intended to correspond
           roughly to section 1 of the Unix manuals.

       "html1direxp"
           From html1dir.U:

           This variable is the same as the html1dir variable,
           but is filename expanded at configuration time, for
           convenient use in makefiles.

       "html3dir"
           From html3dir.U:

           This variable contains the name of the directory in
           which html source pages are to be put.  This directory
           is for pages that describe libraries or modules.  It
           is intended to correspond roughly to section 3 of the
           Unix manuals.

       "html3direxp"
           From html3dir.U:

           This variable is the same as the html3dir variable,
           but is filename expanded at configuration time, for
           convenient use in makefiles.

   i
       "i16size"
           From perlxv.U:

           This variable is the size of an I16 in bytes.

       "i16type"
           From perlxv.U:

           This variable contains the C type used for Perl's I16.

       "i32size"
           From perlxv.U:

           This variable is the size of an I32 in bytes.

       "i32type"
           From perlxv.U:

           This variable contains the C type used for Perl's I32.

       "i64size"
           From perlxv.U:

           This variable is the size of an I64 in bytes.




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       "i64type"
           From perlxv.U:

           This variable contains the C type used for Perl's I64.

       "i8size"
           From perlxv.U:

           This variable is the size of an I8 in bytes.

       "i8type"
           From perlxv.U:

           This variable contains the C type used for Perl's I8.

       "i_arpainet"
           From i_arpainet.U:

           This variable conditionally defines the "I_ARPA_INET"
           symbol, and indicates whether a C program should
           include <arpa/inet.h>.

       "i_assert"
           From i_assert.U:

           This variable conditionally defines the "I_ASSERT"
           symbol, which indicates to the C program that
           <assert.h> exists and could be included.

       "i_bsdioctl"
           From i_sysioctl.U:

           This variable conditionally defines the
           "I_SYS_BSDIOCTL" symbol, which indicates to the C
           program that <sys/bsdioctl.h> exists and should be
           included.

       "i_crypt"
           From i_crypt.U:

           This variable conditionally defines the "I_CRYPT"
           symbol, and indicates whether a C program should
           include <crypt.h>.

       "i_db"
           From i_db.U:

           This variable conditionally defines the "I_DB" symbol,
           and indicates whether a C program may include
           Berkeley's "DB" include file <db.h>.

       "i_dbm"
           From i_dbm.U:




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           This variable conditionally defines the "I_DBM"
           symbol, which indicates to the C program that <dbm.h>
           exists and should be included.

       "i_dirent"
           From i_dirent.U:

           This variable conditionally defines "I_DIRENT", which
           indicates to the C program that it should include
           <dirent.h>.

       "i_dld"
           From i_dld.U:

           This variable conditionally defines the "I_DLD"
           symbol, which indicates to the C program that <dld.h>
           ("GNU" dynamic loading) exists and should be included.

       "i_dlfcn"
           From i_dlfcn.U:

           This variable conditionally defines the "I_DLFCN"
           symbol, which indicates to the C program that
           <dlfcn.h> exists and should be included.

       "i_fcntl"
           From i_fcntl.U:

           This variable controls the value of "I_FCNTL" (which
           tells the C program to include <fcntl.h>).

       "i_float"
           From i_float.U:

           This variable conditionally defines the "I_FLOAT"
           symbol, and indicates whether a C program may include
           <float.h> to get symbols like "DBL_MAX" or "DBL_MIN",
           i.e. machine dependent floating point values.

       "i_fp"
           From i_fp.U:

           This variable conditionally defines the "I_FP" symbol,
           and indicates whether a C program should include
           <fp.h>.

       "i_fp_class"
           From i_fp_class.U:

           This variable conditionally defines the "I_FP_CLASS"
           symbol, and indicates whether a C program should
           include <fp_class.h>.





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       "i_gdbm"
           From i_gdbm.U:

           This variable conditionally defines the "I_GDBM"
           symbol, which indicates to the C program that <gdbm.h>
           exists and should be included.

       "i_gdbm_ndbm"
           From i_ndbm.U:

           This variable conditionally defines the "I_GDBM_NDBM"
           symbol, which indicates to the C program that
           <gdbm-ndbm.h> exists and should be included.  This is
           the location of the ndbm.h compatibility file in
           Debian 4.0.

       "i_gdbmndbm"
           From i_ndbm.U:

           This variable conditionally defines the "I_GDBMNDBM"
           symbol, which indicates to the C program that
           <gdbm/ndbm.h> exists and should be included.  This was
           the location of the ndbm.h compatibility file in
           RedHat 7.1.

       "i_grp"
           From i_grp.U:

           This variable conditionally defines the "I_GRP"
           symbol, and indicates whether a C program should
           include <grp.h>.

       "i_ieeefp"
           From i_ieeefp.U:

           This variable conditionally defines the "I_IEEEFP"
           symbol, and indicates whether a C program should
           include <ieeefp.h>.

       "i_inttypes"
           From i_inttypes.U:

           This variable conditionally defines the "I_INTTYPES"
           symbol, and indicates whether a C program should
           include <inttypes.h>.

       "i_langinfo"
           From i_langinfo.U:

           This variable conditionally defines the "I_LANGINFO"
           symbol, and indicates whether a C program should
           include <langinfo.h>.





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       "i_libutil"
           From i_libutil.U:

           This variable conditionally defines the "I_LIBUTIL"
           symbol, and indicates whether a C program should
           include <libutil.h>.

       "i_limits"
           From i_limits.U:

           This variable conditionally defines the "I_LIMITS"
           symbol, and indicates whether a C program may include
           <limits.h> to get symbols like "WORD_BIT" and friends.

       "i_locale"
           From i_locale.U:

           This variable conditionally defines the "I_LOCALE"
           symbol, and indicates whether a C program should
           include <locale.h>.

       "i_machcthr"
           From i_machcthr.U:

           This variable conditionally defines the
           "I_MACH_CTHREADS" symbol, and indicates whether a C
           program should include <mach/cthreads.h>.

       "i_malloc"
           From i_malloc.U:

           This variable conditionally defines the "I_MALLOC"
           symbol, and indicates whether a C program should
           include <malloc.h>.

       "i_mallocmalloc"
           From i_mallocmalloc.U:

           This variable conditionally defines the
           "I_MALLOCMALLOC" symbol, and indicates whether a C
           program should include <malloc/malloc.h>.

       "i_math"
           From i_math.U:

           This variable conditionally defines the "I_MATH"
           symbol, and indicates whether a C program may include
           <math.h>.

       "i_memory"
           From i_memory.U:

           This variable conditionally defines the "I_MEMORY"
           symbol, and indicates whether a C program should



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           include <memory.h>.

       "i_mntent"
           From i_mntent.U:

           This variable conditionally defines the "I_MNTENT"
           symbol, and indicates whether a C program should
           include <mntent.h>.

       "i_ndbm"
           From i_ndbm.U:

           This variable conditionally defines the "I_NDBM"
           symbol, which indicates to the C program that <ndbm.h>
           exists and should be included.

       "i_netdb"
           From i_netdb.U:

           This variable conditionally defines the "I_NETDB"
           symbol, and indicates whether a C program should
           include <netdb.h>.

       "i_neterrno"
           From i_neterrno.U:

           This variable conditionally defines the "I_NET_ERRNO"
           symbol, which indicates to the C program that
           <net/errno.h> exists and should be included.

       "i_netinettcp"
           From i_netinettcp.U:

           This variable conditionally defines the
           "I_NETINET_TCP" symbol, and indicates whether a C
           program should include <netinet/tcp.h>.

       "i_niin"
           From i_niin.U:

           This variable conditionally defines "I_NETINET_IN",
           which indicates to the C program that it should
           include <netinet/in.h>. Otherwise, you may try
           <sys/in.h>.

       "i_poll"
           From i_poll.U:

           This variable conditionally defines the "I_POLL"
           symbol, and indicates whether a C program should
           include <poll.h>.

       "i_prot"
           From i_prot.U:



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           This variable conditionally defines the "I_PROT"
           symbol, and indicates whether a C program should
           include <prot.h>.

       "i_pthread"
           From i_pthread.U:

           This variable conditionally defines the "I_PTHREAD"
           symbol, and indicates whether a C program should
           include <pthread.h>.

       "i_pwd"
           From i_pwd.U:

           This variable conditionally defines "I_PWD", which
           indicates to the C program that it should include
           <pwd.h>.

       "i_rpcsvcdbm"
           From i_dbm.U:

           This variable conditionally defines the "I_RPCSVC_DBM"
           symbol, which indicates to the C program that
           <rpcsvc/dbm.h> exists and should be included.  Some
           System V systems might need this instead of <dbm.h>.

       "i_sfio"
           From i_sfio.U:

           This variable conditionally defines the "I_SFIO"
           symbol, and indicates whether a C program should
           include <sfio.h>.

       "i_sgtty"
           From i_termio.U:

           This variable conditionally defines the "I_SGTTY"
           symbol, which indicates to the C program that it
           should include <sgtty.h> rather than <termio.h>.

       "i_shadow"
           From i_shadow.U:

           This variable conditionally defines the "I_SHADOW"
           symbol, and indicates whether a C program should
           include <shadow.h>.

       "i_socks"
           From i_socks.U:

           This variable conditionally defines the "I_SOCKS"
           symbol, and indicates whether a C program should
           include <socks.h>.




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       "i_stdarg"
           From i_varhdr.U:

           This variable conditionally defines the "I_STDARG"
           symbol, which indicates to the C program that
           <stdarg.h> exists and should be included.

       "i_stddef"
           From i_stddef.U:

           This variable conditionally defines the "I_STDDEF"
           symbol, which indicates to the C program that
           <stddef.h> exists and should be included.

       "i_stdlib"
           From i_stdlib.U:

           This variable conditionally defines the "I_STDLIB"
           symbol, which indicates to the C program that
           <stdlib.h> exists and should be included.

       "i_string"
           From i_string.U:

           This variable conditionally defines the "I_STRING"
           symbol, which indicates that <string.h> should be
           included rather than <strings.h>.

       "i_sunmath"
           From i_sunmath.U:

           This variable conditionally defines the "I_SUNMATH"
           symbol, and indicates whether a C program should
           include <sunmath.h>.

       "i_sysaccess"
           From i_sysaccess.U:

           This variable conditionally defines the "I_SYS_ACCESS"
           symbol, and indicates whether a C program should
           include <sys/access.h>.

       "i_sysdir"
           From i_sysdir.U:

           This variable conditionally defines the "I_SYS_DIR"
           symbol, and indicates whether a C program should
           include <sys/dir.h>.

       "i_sysfile"
           From i_sysfile.U:

           This variable conditionally defines the "I_SYS_FILE"
           symbol, and indicates whether a C program should



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           include <sys/file.h> to get "R_OK" and friends.

       "i_sysfilio"
           From i_sysioctl.U:

           This variable conditionally defines the "I_SYS_FILIO"
           symbol, which indicates to the C program that
           <sys/filio.h> exists and should be included in
           preference to <sys/ioctl.h>.

       "i_sysin"
           From i_niin.U:

           This variable conditionally defines "I_SYS_IN", which
           indicates to the C program that it should include
           <sys/in.h> instead of <netinet/in.h>.

       "i_sysioctl"
           From i_sysioctl.U:

           This variable conditionally defines the "I_SYS_IOCTL"
           symbol, which indicates to the C program that
           <sys/ioctl.h> exists and should be included.

       "i_syslog"
           From i_syslog.U:

           This variable conditionally defines the "I_SYSLOG"
           symbol, and indicates whether a C program should
           include <syslog.h>.

       "i_sysmman"
           From i_sysmman.U:

           This variable conditionally defines the "I_SYS_MMAN"
           symbol, and indicates whether a C program should
           include <sys/mman.h>.

       "i_sysmode"
           From i_sysmode.U:

           This variable conditionally defines the "I_SYSMODE"
           symbol, and indicates whether a C program should
           include <sys/mode.h>.

       "i_sysmount"
           From i_sysmount.U:

           This variable conditionally defines the "I_SYSMOUNT"
           symbol, and indicates whether a C program should
           include <sys/mount.h>.

       "i_sysndir"
           From i_sysndir.U:



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           This variable conditionally defines the "I_SYS_NDIR"
           symbol, and indicates whether a C program should
           include <sys/ndir.h>.

       "i_sysparam"
           From i_sysparam.U:

           This variable conditionally defines the "I_SYS_PARAM"
           symbol, and indicates whether a C program should
           include <sys/param.h>.

       "i_syspoll"
           From i_syspoll.U:

           This variable conditionally defines the "I_SYS_POLL"
           symbol, which indicates to the C program that it
           should include <sys/poll.h>.

       "i_sysresrc"
           From i_sysresrc.U:

           This variable conditionally defines the
           "I_SYS_RESOURCE" symbol, and indicates whether a C
           program should include <sys/resource.h>.

       "i_syssecrt"
           From i_syssecrt.U:

           This variable conditionally defines the
           "I_SYS_SECURITY" symbol, and indicates whether a C
           program should include <sys/security.h>.

       "i_sysselct"
           From i_sysselct.U:

           This variable conditionally defines "I_SYS_SELECT",
           which indicates to the C program that it should
           include <sys/select.h> in order to get the definition
           of struct timeval.

       "i_syssockio"
           From i_sysioctl.U:

           This variable conditionally defines "I_SYS_SOCKIO" to
           indicate to the C program that socket ioctl codes may
           be found in <sys/sockio.h> instead of <sys/ioctl.h>.

       "i_sysstat"
           From i_sysstat.U:

           This variable conditionally defines the "I_SYS_STAT"
           symbol, and indicates whether a C program should
           include <sys/stat.h>.




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       "i_sysstatfs"
           From i_sysstatfs.U:

           This variable conditionally defines the "I_SYSSTATFS"
           symbol, and indicates whether a C program should
           include <sys/statfs.h>.

       "i_sysstatvfs"
           From i_sysstatvfs.U:

           This variable conditionally defines the "I_SYSSTATVFS"
           symbol, and indicates whether a C program should
           include <sys/statvfs.h>.

       "i_systime"
           From i_time.U:

           This variable conditionally defines "I_SYS_TIME",
           which indicates to the C program that it should
           include <sys/time.h>.

       "i_systimek"
           From i_time.U:

           This variable conditionally defines
           "I_SYS_TIME_KERNEL", which indicates to the C program
           that it should include <sys/time.h> with "KERNEL"
           defined.

       "i_systimes"
           From i_systimes.U:

           This variable conditionally defines the "I_SYS_TIMES"
           symbol, and indicates whether a C program should
           include <sys/times.h>.

       "i_systypes"
           From i_systypes.U:

           This variable conditionally defines the "I_SYS_TYPES"
           symbol, and indicates whether a C program should
           include <sys/types.h>.

       "i_sysuio"
           From i_sysuio.U:

           This variable conditionally defines the "I_SYSUIO"
           symbol, and indicates whether a C program should
           include <sys/uio.h>.

       "i_sysun"
           From i_sysun.U:

           This variable conditionally defines "I_SYS_UN", which



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           indicates to the C program that it should include
           <sys/un.h> to get "UNIX" domain socket definitions.

       "i_sysutsname"
           From i_sysutsname.U:

           This variable conditionally defines the "I_SYSUTSNAME"
           symbol, and indicates whether a C program should
           include <sys/utsname.h>.

       "i_sysvfs"
           From i_sysvfs.U:

           This variable conditionally defines the "I_SYSVFS"
           symbol, and indicates whether a C program should
           include <sys/vfs.h>.

       "i_syswait"
           From i_syswait.U:

           This variable conditionally defines "I_SYS_WAIT",
           which indicates to the C program that it should
           include <sys/wait.h>.

       "i_termio"
           From i_termio.U:

           This variable conditionally defines the "I_TERMIO"
           symbol, which indicates to the C program that it
           should include <termio.h> rather than <sgtty.h>.

       "i_termios"
           From i_termio.U:

           This variable conditionally defines the "I_TERMIOS"
           symbol, which indicates to the C program that the
           "POSIX" <termios.h> file is to be included.

       "i_time"
           From i_time.U:

           This variable conditionally defines "I_TIME", which
           indicates to the C program that it should include
           <time.h>.

       "i_unistd"
           From i_unistd.U:

           This variable conditionally defines the "I_UNISTD"
           symbol, and indicates whether a C program should
           include <unistd.h>.

       "i_ustat"
           From i_ustat.U:



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           This variable conditionally defines the "I_USTAT"
           symbol, and indicates whether a C program should
           include <ustat.h>.

       "i_utime"
           From i_utime.U:

           This variable conditionally defines the "I_UTIME"
           symbol, and indicates whether a C program should
           include <utime.h>.

       "i_values"
           From i_values.U:

           This variable conditionally defines the "I_VALUES"
           symbol, and indicates whether a C program may include
           <values.h> to get symbols like "MAXLONG" and friends.

       "i_varargs"
           From i_varhdr.U:

           This variable conditionally defines "I_VARARGS", which
           indicates to the C program that it should include
           <varargs.h>.

       "i_varhdr"
           From i_varhdr.U:

           Contains the name of the header to be included to get
           va_dcl definition.  Typically one of varargs.h or
           stdarg.h.

       "i_vfork"
           From i_vfork.U:

           This variable conditionally defines the "I_VFORK"
           symbol, and indicates whether a C program should
           include vfork.h.

       "ignore_versioned_solibs"
           From libs.U:

           This variable should be non-empty if non-versioned
           shared libraries (libfoo.so.x.y) are to be ignored
           (because they cannot be linked against).

       "inc_version_list"
           From inc_version_list.U:

           This variable specifies the list of subdirectories in
           over which perl.c:incpush() and lib/lib.pm will
           automatically search when adding directories to
           @"INC".  The elements in the list are separated by
           spaces.  This is only useful if you have a perl



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           library directory tree structured like the default
           one.  See "INSTALL" for how this works.  The versioned
           site_perl directory was introduced in 5.005, so that
           is the lowest possible value.

           This list includes architecture-dependent directories
           back to version $api_versionstring (e.g. 5.5.640) and
           architecture-independent directories all the way back
           to 5.005.

       "inc_version_list_init"
           From inc_version_list.U:

           This variable holds the same list as inc_version_list,
           but each item is enclosed in double quotes and
           separated by commas, suitable for use in the
           "PERL_INC_VERSION_LIST" initialization.

       "incpath"
           From usrinc.U:

           This variable must preceed the normal include path to
           get hte right one, as in $incpath/usr/include or
           $incpath/usr/lib.  Value can be "" or /bsd43 on mips.

       "inews"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "initialinstalllocation"
           From bin.U:

           When userelocatableinc is true, this variable holds
           the location that make install should copy the perl
           binary to, with all the run-time relocatable paths
           calculated from this at install time.  When used, it
           is initialised to the original value of binexp, and
           then binexp is set to .../, as the other binaries are
           found relative to the perl binary.

       "installarchlib"
           From archlib.U:

           This variable is really the same as archlibexp but may
           differ on those systems using "AFS". For extra
           portability, only this variable should be used in
           makefiles.

       "installbin"
           From bin.U:

           This variable is the same as binexp unless "AFS" is



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           running in which case the user is explicitely prompted
           for it. This variable should always be used in your
           makefiles for maximum portability.

       "installhtml1dir"
           From html1dir.U:

           This variable is really the same as html1direxp,
           unless you are using a different installprefix.  For
           extra portability, you should only use this variable
           within your makefiles.

       "installhtml3dir"
           From html3dir.U:

           This variable is really the same as html3direxp,
           unless you are using a different installprefix.  For
           extra portability, you should only use this variable
           within your makefiles.

       "installman1dir"
           From man1dir.U:

           This variable is really the same as man1direxp, unless
           you are using "AFS" in which case it points to the
           read/write location whereas man1direxp only points to
           the read-only access location. For extra portability,
           you should only use this variable within your
           makefiles.

       "installman3dir"
           From man3dir.U:

           This variable is really the same as man3direxp, unless
           you are using "AFS" in which case it points to the
           read/write location whereas man3direxp only points to
           the read-only access location. For extra portability,
           you should only use this variable within your
           makefiles.

       "installprefix"
           From installprefix.U:

           This variable holds the name of the directory below
           which "make install" will install the package.  For
           most users, this is the same as prefix.  However, it
           is useful for installing the software into a different
           (usually temporary) location after which it can be
           bundled up and moved somehow to the final location
           specified by prefix.

       "installprefixexp"
           From installprefix.U:




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           This variable holds the full absolute path of
           installprefix with all ~-expansion done.

       "installprivlib"
           From privlib.U:

           This variable is really the same as privlibexp but may
           differ on those systems using "AFS". For extra
           portability, only this variable should be used in
           makefiles.

       "installscript"
           From scriptdir.U:

           This variable is usually the same as scriptdirexp,
           unless you are on a system running "AFS", in which
           case they may differ slightly. You should always use
           this variable within your makefiles for portability.

       "installsitearch"
           From sitearch.U:

           This variable is really the same as sitearchexp but
           may differ on those systems using "AFS". For extra
           portability, only this variable should be used in
           makefiles.

       "installsitebin"
           From sitebin.U:

           This variable is usually the same as sitebinexp,
           unless you are on a system running "AFS", in which
           case they may differ slightly. You should always use
           this variable within your makefiles for portability.

       "installsitehtml1dir"
           From sitehtml1dir.U:

           This variable is really the same as sitehtml1direxp,
           unless you are using "AFS" in which case it points to
           the read/write location whereas html1direxp only
           points to the read-only access location. For extra
           portability, you should only use this variable within
           your makefiles.

       "installsitehtml3dir"
           From sitehtml3dir.U:

           This variable is really the same as sitehtml3direxp,
           unless you are using "AFS" in which case it points to
           the read/write location whereas html3direxp only
           points to the read-only access location. For extra
           portability, you should only use this variable within
           your makefiles.



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       "installsitelib"
           From sitelib.U:

           This variable is really the same as sitelibexp but may
           differ on those systems using "AFS". For extra
           portability, only this variable should be used in
           makefiles.

       "installsiteman1dir"
           From siteman1dir.U:

           This variable is really the same as siteman1direxp,
           unless you are using "AFS" in which case it points to
           the read/write location whereas man1direxp only points
           to the read-only access location. For extra
           portability, you should only use this variable within
           your makefiles.

       "installsiteman3dir"
           From siteman3dir.U:

           This variable is really the same as siteman3direxp,
           unless you are using "AFS" in which case it points to
           the read/write location whereas man3direxp only points
           to the read-only access location. For extra
           portability, you should only use this variable within
           your makefiles.

       "installsitescript"
           From sitescript.U:

           This variable is usually the same as sitescriptexp,
           unless you are on a system running "AFS", in which
           case they may differ slightly. You should always use
           this variable within your makefiles for portability.

       "installstyle"
           From installstyle.U:

           This variable describes the "style" of the perl
           installation.  This is intended to be useful for tools
           that need to manipulate entire perl distributions.
           Perl itself doesn't use this to find its libraries --
           the library directories are stored directly in
           Config.pm.  Currently, there are only two styles:
           "lib" and lib/perl5.  The default library locations
           (e.g. privlib, sitelib) are either $prefix/lib or
           $prefix/lib/perl5.  The former is useful if $prefix is
           a directory dedicated to perl (e.g. /opt/perl), while
           the latter is useful if $prefix is shared by many
           packages, e.g. if $prefix=/usr/local.

           Unfortunately, while this "style" variable is used to
           set defaults for all three directory hierarchies



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           (core, vendor, and site), there is no guarantee that
           the same style is actually appropriate for all those
           directories.  For example, $prefix might be /opt/perl,
           but $siteprefix might be /usr/local.  (Perhaps, in
           retrospect, the "lib" style should never have been
           supported, but it did seem like a nice idea at the
           time.)

           The situation is even less clear for tools such as
           MakeMaker that can be used to install additional
           modules into non-standard places.  For example, if a
           user intends to install a module into a private
           directory (perhaps by setting "PREFIX" on the
           Makefile.PL command line), then there is no reason to
           assume that the Configure-time $installstyle setting
           will be relevant for that "PREFIX".

           This may later be extended to include other
           information, so be careful with pattern-matching on
           the results.

           For compatibility with perl5.005 and earlier, the
           default setting is based on whether or not $prefix
           contains the string "perl".

       "installusrbinperl"
           From instubperl.U:

           This variable tells whether Perl should be installed
           also as /usr/bin/perl in addition to $installbin/perl

       "installvendorarch"
           From vendorarch.U:

           This variable is really the same as vendorarchexp but
           may differ on those systems using "AFS". For extra
           portability, only this variable should be used in
           makefiles.

       "installvendorbin"
           From vendorbin.U:

           This variable is really the same as vendorbinexp but
           may differ on those systems using "AFS". For extra
           portability, only this variable should be used in
           makefiles.

       "installvendorhtml1dir"
           From vendorhtml1dir.U:

           This variable is really the same as vendorhtml1direxp
           but may differ on those systems using "AFS". For extra
           portability, only this variable should be used in
           makefiles.



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       "installvendorhtml3dir"
           From vendorhtml3dir.U:

           This variable is really the same as vendorhtml3direxp
           but may differ on those systems using "AFS". For extra
           portability, only this variable should be used in
           makefiles.

       "installvendorlib"
           From vendorlib.U:

           This variable is really the same as vendorlibexp but
           may differ on those systems using "AFS". For extra
           portability, only this variable should be used in
           makefiles.

       "installvendorman1dir"
           From vendorman1dir.U:

           This variable is really the same as vendorman1direxp
           but may differ on those systems using "AFS". For extra
           portability, only this variable should be used in
           makefiles.

       "installvendorman3dir"
           From vendorman3dir.U:

           This variable is really the same as vendorman3direxp
           but may differ on those systems using "AFS". For extra
           portability, only this variable should be used in
           makefiles.

       "installvendorscript"
           From vendorscript.U:

           This variable is really the same as vendorscriptexp
           but may differ on those systems using "AFS". For extra
           portability, only this variable should be used in
           makefiles.

       "intsize"
           From intsize.U:

           This variable contains the value of the "INTSIZE"
           symbol, which indicates to the C program how many
           bytes there are in an int.

       "issymlink"
           From issymlink.U:

           This variable holds the test command to test for a
           symbolic link (if they are supported).  Typical values
           include "test -h" and "test -L".




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       "ivdformat"
           From perlxvf.U:

           This variable contains the format string used for
           printing a Perl "IV" as a signed decimal integer.

       "ivsize"
           From perlxv.U:

           This variable is the size of an "IV" in bytes.

       "ivtype"
           From perlxv.U:

           This variable contains the C type used for Perl's
           "IV".

   k
       "known_extensions"
           From Extensions.U:

           This variable holds a list of all "XS" extensions
           included in the package.

       "ksh"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

   l
       "ld"
           From dlsrc.U:

           This variable indicates the program to be used to link
           libraries for dynamic loading.  On some systems, it is
           "ld".  On "ELF" systems, it should be $cc.  Mostly,
           we'll try to respect the hint file setting.

       "lddlflags"
           From dlsrc.U:

           This variable contains any special flags that might
           need to be passed to $ld to create a shared library
           suitable for dynamic loading.  It is up to the
           makefile to use it.  For hpux, it should be "-b".  For
           sunos 4.1, it is empty.

       "ldflags"
           From ccflags.U:

           This variable contains any additional C loader flags
           desired by the user.  It is up to the Makefile to use
           this.



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       "ldflags_uselargefiles"
           From uselfs.U:

           This variable contains the loader flags needed by
           large file builds and added to ldflags by hints files.

       "ldlibpthname"
           From libperl.U:

           This variable holds the name of the shared library
           search path, often "LD_LIBRARY_PATH".  To get an empty
           string, the hints file must set this to "none".

       "less"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the less
           program.  After Configure runs, the value is reset to
           a plain "less" and is not useful.

       "lib_ext"
           From Unix.U:

           This is an old synonym for _a.

       "libc"
           From libc.U:

           This variable contains the location of the C library.

       "libperl"
           From libperl.U:

           The perl executable is obtained by linking perlmain.c
           with libperl, any static extensions (usually just
           DynaLoader), and any other libraries needed on this
           system.  libperl is usually libperl.a, but can also be
           libperl.so.xxx if the user wishes to build a perl
           executable with a shared library.

       "libpth"
           From libpth.U:

           This variable holds the general path (space-separated)
           used to find libraries. It is intended to be used by
           other units.

       "libs"
           From libs.U:

           This variable holds the additional libraries we want
           to use.  It is up to the Makefile to deal with it.
           The list can be empty.



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       "libsdirs"
           From libs.U:

           This variable holds the directory names aka dirnames
           of the libraries we found and accepted, duplicates are
           removed.

       "libsfiles"
           From libs.U:

           This variable holds the filenames aka basenames of the
           libraries we found and accepted.

       "libsfound"
           From libs.U:

           This variable holds the full pathnames of the
           libraries we found and accepted.

       "libspath"
           From libs.U:

           This variable holds the directory names probed for
           libraries.

       "libswanted"
           From Myinit.U:

           This variable holds a list of all the libraries we
           want to search.  The order is chosen to pick up the c
           library ahead of ucb or bsd libraries for SVR4.

       "libswanted_uselargefiles"
           From uselfs.U:

           This variable contains the libraries needed by large
           file builds and added to ldflags by hints files.  It
           is a space separated list of the library names without
           the "lib" prefix or any suffix, just like libswanted..

       "line"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "lint"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "lkflags"
           From ccflags.U:



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           This variable contains any additional C partial linker
           flags desired by the user.  It is up to the Makefile
           to use this.

       "ln"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the ln
           program.  After Configure runs, the value is reset to
           a plain "ln" and is not useful.

       "lns"
           From lns.U:

           This variable holds the name of the command to make
           symbolic links (if they are supported).  It can be
           used in the Makefile. It is either "ln -s" or "ln"

       "localtime_r_proto"
           From d_localtime_r.U:

           This variable encodes the prototype of localtime_r.
           It is zero if d_localtime_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_localtime_r is defined.

       "locincpth"
           From ccflags.U:

           This variable contains a list of additional
           directories to be searched by the compiler.  The
           appropriate "-I" directives will be added to ccflags.
           This is intended to simplify setting local directories
           from the Configure command line.  It's not much, but
           it parallels the loclibpth stuff in libpth.U.

       "loclibpth"
           From libpth.U:

           This variable holds the paths (space-separated) used
           to find local libraries.  It is prepended to libpth,
           and is intended to be easily set from the command
           line.

       "longdblsize"
           From d_longdbl.U:

           This variable contains the value of the
           "LONG_DOUBLESIZE" symbol, which indicates to the C
           program how many bytes there are in a long double, if
           this system supports long doubles.





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       "longlongsize"
           From d_longlong.U:

           This variable contains the value of the "LONGLONGSIZE"
           symbol, which indicates to the C program how many
           bytes there are in a long long, if this system
           supports long long.

       "longsize"
           From intsize.U:

           This variable contains the value of the "LONGSIZE"
           symbol, which indicates to the C program how many
           bytes there are in a long.

       "lp"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "lpr"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "ls"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the ls
           program.  After Configure runs, the value is reset to
           a plain "ls" and is not useful.

       "lseeksize"
           From lseektype.U:

           This variable defines lseektype to be something like
           off_t, long, or whatever type is used to declare lseek
           offset's type in the kernel (which also appears to be
           lseek's return type).

       "lseektype"
           From lseektype.U:

           This variable defines lseektype to be something like
           off_t, long, or whatever type is used to declare lseek
           offset's type in the kernel (which also appears to be
           lseek's return type).

   m
       "mad"
           From mad.U:



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           This variable indicates that the Misc Attribute
           Definition code is to be compiled.

       "madlyh"
           From mad.U:

           If the Misc Attribute Decoration is to be compiled,
           this variable is set to the name of the extra header
           files to be used, else it is ''

       "madlyobj"
           From mad.U:

           If the Misc Attribute Decoration is to be compiled,
           this variable is set to the name of the extra object
           files to be used, else it is ''

       "madlysrc"
           From mad.U:

           If the Misc Attribute Decoration is to be compiled,
           this variable is set to the name of the extra C source
           files to be used, else it is ''

       "mail"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "mailx"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "make"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the make
           program.  After Configure runs, the value is reset to
           a plain "make" and is not useful.

       "make_set_make"
           From make.U:

           Some versions of "make" set the variable "MAKE".
           Others do not.  This variable contains the string to
           be included in Makefile.SH so that "MAKE" is set if
           needed, and not if not needed.  Possible values are:

           make_set_make="#"        # If your make program
           handles this for you,



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           make_set_make="MAKE=$make"    # if it doesn't.

           This uses a comment character so that we can
           distinguish a "set" value (from a previous config.sh
           or Configure "-D" option) from an uncomputed value.

       "mallocobj"
           From mallocsrc.U:

           This variable contains the name of the malloc.o that
           this package generates, if that malloc.o is preferred
           over the system malloc.  Otherwise the value is null.
           This variable is intended for generating Makefiles.
           See mallocsrc.

       "mallocsrc"
           From mallocsrc.U:

           This variable contains the name of the malloc.c that
           comes with the package, if that malloc.c is preferred
           over the system malloc.  Otherwise the value is null.
           This variable is intended for generating Makefiles.

       "malloctype"
           From mallocsrc.U:

           This variable contains the kind of ptr returned by
           malloc and realloc.

       "man1dir"
           From man1dir.U:

           This variable contains the name of the directory in
           which manual source pages are to be put.  It is the
           responsibility of the Makefile.SH to get the value of
           this into the proper command.  You must be prepared to
           do the ~name expansion yourself.

       "man1direxp"
           From man1dir.U:

           This variable is the same as the man1dir variable, but
           is filename expanded at configuration time, for
           convenient use in makefiles.

       "man1ext"
           From man1dir.U:

           This variable contains the extension that the manual
           page should have: one of "n", "l", or 1.  The Makefile
           must supply the ..  See man1dir.

       "man3dir"
           From man3dir.U:



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           This variable contains the name of the directory in
           which manual source pages are to be put.  It is the
           responsibility of the Makefile.SH to get the value of
           this into the proper command.  You must be prepared to
           do the ~name expansion yourself.

       "man3direxp"
           From man3dir.U:

           This variable is the same as the man3dir variable, but
           is filename expanded at configuration time, for
           convenient use in makefiles.

       "man3ext"
           From man3dir.U:

           This variable contains the extension that the manual
           page should have: one of "n", "l", or 3.  The Makefile
           must supply the ..  See man3dir.

       "mips_type"
           From usrinc.U:

           This variable holds the environment type for the mips
           system.  Possible values are "BSD 4.3" and "System V".

       "mistrustnm"
           From Csym.U:

           This variable can be used to establish a fallthrough
           for the cases where nm fails to find a symbol.  If
           usenm is false or usenm is true and mistrustnm is
           false, this variable has no effect.  If usenm is true
           and mistrustnm is "compile", a test program will be
           compiled to try to find any symbol that can't be
           located via nm lookup.  If mistrustnm is "run", the
           test program will be run as well as being compiled.

       "mkdir"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the mkdir
           program.  After Configure runs, the value is reset to
           a plain "mkdir" and is not useful.

       "mmaptype"
           From d_mmap.U:

           This symbol contains the type of pointer returned by
           mmap() (and simultaneously the type of the first
           argument).  It can be "void *" or "caddr_t".





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       "modetype"
           From modetype.U:

           This variable defines modetype to be something like
           mode_t, int, unsigned short, or whatever type is used
           to declare file modes for system calls.

       "more"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the more
           program.  After Configure runs, the value is reset to
           a plain "more" and is not useful.

       "multiarch"
           From multiarch.U:

           This variable conditionally defines the "MULTIARCH"
           symbol which signifies the presence of multiplatform
           files.  This is normally set by hints files.

       "mv"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "myarchname"
           From archname.U:

           This variable holds the architecture name computed by
           Configure in a previous run. It is not intended to be
           perused by any user and should never be set in a hint
           file.

       "mydomain"
           From myhostname.U:

           This variable contains the eventual value of the
           "MYDOMAIN" symbol, which is the domain of the host the
           program is going to run on.  The domain must be
           appended to myhostname to form a complete host name.
           The dot comes with mydomain, and need not be supplied
           by the program.

       "myhostname"
           From myhostname.U:

           This variable contains the eventual value of the
           "MYHOSTNAME" symbol, which is the name of the host the
           program is going to run on.  The domain is not kept
           with hostname, but must be gotten from mydomain.  The
           dot comes with mydomain, and need not be supplied by



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           the program.

       "myuname"
           From Oldconfig.U:

           The output of "uname -a" if available, otherwise the
           hostname. On Xenix, pseudo variables assignments in
           the output are stripped, thank you. The whole thing is
           then lower-cased.

   n
       "n" From n.U:

           This variable contains the "-n" flag if that is what
           causes the echo command to suppress newline.
           Otherwise it is null.  Correct usage is $echo $n
           "prompt for a question: $c".

       "need_va_copy"
           From need_va_copy.U:

           This symbol, if defined, indicates that the system
           stores the variable argument list datatype, va_list,
           in a format that cannot be copied by simple
           assignment, so that some other means must be used when
           copying is required.  As such systems vary in their
           provision (or non-provision) of copying mechanisms,
           handy.h defines a platform- "independent" macro,
           Perl_va_copy(src, dst), to do the job.

       "netdb_hlen_type"
           From netdbtype.U:

           This variable holds the type used for the 2nd argument
           to gethostbyaddr().  Usually, this is int or size_t or
           unsigned.  This is only useful if you have
           gethostbyaddr(), naturally.

       "netdb_host_type"
           From netdbtype.U:

           This variable holds the type used for the 1st argument
           to gethostbyaddr().  Usually, this is char * or void
           *,  possibly with or without a const prefix.  This is
           only useful if you have gethostbyaddr(), naturally.

       "netdb_name_type"
           From netdbtype.U:

           This variable holds the type used for the argument to
           gethostbyname().  Usually, this is char * or const
           char *.  This is only useful if you have
           gethostbyname(), naturally.




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       "netdb_net_type"
           From netdbtype.U:

           This variable holds the type used for the 1st argument
           to getnetbyaddr().  Usually, this is int or long.
           This is only useful if you have getnetbyaddr(),
           naturally.

       "nm"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the nm
           program.  After Configure runs, the value is reset to
           a plain "nm" and is not useful.

       "nm_opt"
           From usenm.U:

           This variable holds the options that may be necessary
           for nm.

       "nm_so_opt"
           From usenm.U:

           This variable holds the options that may be necessary
           for nm to work on a shared library but that can not be
           used on an archive library.  Currently, this is only
           used by Linux, where nm --dynamic is *required* to get
           symbols from an "ELF" library which has been stripped,
           but nm --dynamic is *fatal* on an archive library.
           Maybe Linux should just always set usenm=false.

       "nonxs_ext"
           From Extensions.U:

           This variable holds a list of all non-xs extensions
           included in the package.  All of them will be built.

       "nroff"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the nroff
           program.  After Configure runs, the value is reset to
           a plain "nroff" and is not useful.

       "nv_overflows_integers_at"
           From perlxv.U:

           This variable gives the largest integer value that NVs
           can hold as a constant floating point expression.  If
           it could not be determined, it holds the value 0.




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       "nv_preserves_uv_bits"
           From perlxv.U:

           This variable indicates how many of bits type uvtype a
           variable nvtype can preserve.

       "nveformat"
           From perlxvf.U:

           This variable contains the format string used for
           printing a Perl "NV" using %e-ish floating point
           format.

       "nvEUformat"
           From perlxvf.U:

           This variable contains the format string used for
           printing a Perl "NV" using %E-ish floating point
           format.

       "nvfformat"
           From perlxvf.U:

           This variable confains the format string used for
           printing a Perl "NV" using %f-ish floating point
           format.

       "nvFUformat"
           From perlxvf.U:

           This variable confains the format string used for
           printing a Perl "NV" using %F-ish floating point
           format.

       "nvgformat"
           From perlxvf.U:

           This variable contains the format string used for
           printing a Perl "NV" using %g-ish floating point
           format.

       "nvGUformat"
           From perlxvf.U:

           This variable contains the format string used for
           printing a Perl "NV" using %G-ish floating point
           format.

       "nvsize"
           From perlxv.U:

           This variable is the size of an "NV" in bytes.





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       "nvtype"
           From perlxv.U:

           This variable contains the C type used for Perl's
           "NV".

   o
       "o_nonblock"
           From nblock_io.U:

           This variable bears the symbol value to be used during
           open() or fcntl() to turn on non-blocking I/O for a
           file descriptor. If you wish to switch between
           blocking and non-blocking, you may try
           ioctl("FIOSNBIO") instead, but that is only supported
           by some devices.

       "obj_ext"
           From Unix.U:

           This is an old synonym for _o.

       "old_pthread_create_joinable"
           From d_pthrattrj.U:

           This variable defines the constant to use for creating
           joinable (aka undetached) pthreads.  Unused if
           pthread.h defines "PTHREAD_CREATE_JOINABLE".  If used,
           possible values are "PTHREAD_CREATE_UNDETACHED" and
           "__UNDETACHED".

       "optimize"
           From ccflags.U:

           This variable contains any optimizer/debugger flag
           that should be used.  It is up to the Makefile to use
           it.

       "orderlib"
           From orderlib.U:

           This variable is "true" if the components of libraries
           must be ordered (with `lorder $* | tsort`) before
           placing them in an archive.  Set to "false" if ranlib
           or ar can generate random libraries.

       "osname"
           From Oldconfig.U:

           This variable contains the operating system name (e.g.
           sunos, solaris, hpux, etc.).  It can be useful later
           on for setting defaults.  Any spaces are replaced with
           underscores.  It is set to a null string if we can't
           figure it out.



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       "osvers"
           From Oldconfig.U:

           This variable contains the operating system version
           (e.g.  4.1.3, 5.2, etc.).  It is primarily used for
           helping select an appropriate hints file, but might be
           useful elsewhere for setting defaults.  It is set to
           '' if we can't figure it out.  We try to be flexible
           about how much of the version number to keep, e.g. if
           4.1.1, 4.1.2, and 4.1.3 are essentially the same for
           this package, hints files might just be os_4.0 or
           os_4.1, etc., not keeping separate files for each
           little release.

       "otherlibdirs"
           From otherlibdirs.U:

           This variable contains a colon-separated set of paths
           for the perl binary to search for additional library
           files or modules.  These directories will be tacked to
           the end of @"INC".  Perl will automatically search
           below each path for version- and architecture-specific
           directories.  See inc_version_list for more details.
           A value of " " means "none" and is used to preserve
           this value for the next run through Configure.

   p
       "package"
           From package.U:

           This variable contains the name of the package being
           constructed.  It is primarily intended for the use of
           later Configure units.

       "pager"
           From pager.U:

           This variable contains the name of the preferred pager
           on the system.  Usual values are (the full pathnames
           of) more, less, pg, or cat.

       "passcat"
           From nis.U:

           This variable contains a command that produces the
           text of the /etc/passwd file.  This is normally "cat
           /etc/passwd", but can be "ypcat passwd" when "NIS" is
           used.  On some systems, such as os390, there may be no
           equivalent command, in which case this variable is
           unset.

       "patchlevel"
           From patchlevel.U:




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           The patchlevel level of this package.  The value of
           patchlevel comes from the patchlevel.h file.  In a
           version number such as 5.6.1, this is the 6.  In
           patchlevel.h, this is referred to as "PERL_VERSION".

       "path_sep"
           From Unix.U:

           This is an old synonym for p_ in Head.U, the character
           used to separate elements in the command shell search
           "PATH".

       "perl"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "perl5"
           From perl5.U:

           This variable contains the full path (if any) to a
           previously installed perl5.005 or later suitable for
           running the script to determine inc_version_list.

   P
       "PERL_API_REVISION"
           From patchlevel.h:

           This number describes the earliest compatible
           "PERL_REVISION" of Perl ("compatibility" here being
           defined as sufficient binary/"API" compatibility to
           run "XS" code built with the older version).  Normally
           this does not change across maintenance releases.
           Please read the comment in patchlevel.h.

       "PERL_API_SUBVERSION"
           From patchlevel.h:

           This number describes the earliest compatible
           "PERL_SUBVERSION" of Perl ("compatibility" here being
           defined as sufficient binary/"API" compatibility to
           run "XS" code built with the older version).  Normally
           this does not change across maintenance releases.
           Please read the comment in patchlevel.h.

       "PERL_API_VERSION"
           From patchlevel.h:

           This number describes the earliest compatible
           "PERL_VERSION" of Perl ("compatibility" here being
           defined as sufficient binary/"API" compatibility to
           run "XS" code built with the older version).  Normally
           this does not change across maintenance releases.



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           Please read the comment in patchlevel.h.

       "PERL_CONFIG_SH"
           From Oldsyms.U:

           This is set to "true" in config.sh so that a shell
           script sourcing config.sh can tell if it has been
           sourced already.

       "PERL_PATCHLEVEL"
           From Oldsyms.U:

           This symbol reflects the patchlevel, if available.
           Will usually come from the .patch file, which is
           available when the perl source tree was fetched with
           rsync.

       "perl_patchlevel"
           From patchlevel.U:

           This is the Perl patch level, a numeric change
           identifier, as defined by whichever source code
           maintenance system is used to maintain the patches;
           currently Perforce.  It does not correlate with the
           Perl version numbers or the maintenance versus
           development dichotomy except by also being increasing.

       "PERL_REVISION"
           From Oldsyms.U:

           In a Perl version number such as 5.6.2, this is the 5.
           This value is manually set in patchlevel.h

       "PERL_SUBVERSION"
           From Oldsyms.U:

           In a Perl version number such as 5.6.2, this is the 2.
           Values greater than 50 represent potentially unstable
           development subversions.  This value is manually set
           in patchlevel.h

       "PERL_VERSION"
           From Oldsyms.U:

           In a Perl version number such as 5.6.2, this is the 6.
           This value is manually set in patchlevel.h

       "perladmin"
           From perladmin.U:

           Electronic mail address of the perl5 administrator.

       "perllibs"
           From End.U:



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           The list of libraries needed by Perl only (any
           libraries needed by extensions only will by dropped,
           if using dynamic loading).

       "perlpath"
           From perlpath.U:

           This variable contains the eventual value of the
           "PERLPATH" symbol, which contains the name of the perl
           interpreter to be used in shell scripts and in the
           "eval "exec"" idiom.  This variable is not necessarily
           the pathname of the file containing the perl
           interpreter; you must append the executable extension
           (_exe) if it is not already present.  Note that Perl
           code that runs during the Perl build process cannot
           reference this variable, as Perl may not have been
           installed, or even if installed, may be a different
           version of Perl.

       "pg"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the pg
           program.  After Configure runs, the value is reset to
           a plain "pg" and is not useful.

       "phostname"
           From myhostname.U:

           This variable contains the eventual value of the
           "PHOSTNAME" symbol, which is a command that can be fed
           to popen() to get the host name.  The program should
           probably not presume that the domain is or isn't there
           already.

       "pidtype"
           From pidtype.U:

           This variable defines "PIDTYPE" to be something like
           pid_t, int, ushort, or whatever type is used to
           declare process ids in the kernel.

       "plibpth"
           From libpth.U:

           Holds the private path used by Configure to find out
           the libraries.  Its value is prepend to libpth. This
           variable takes care of special machines, like the
           mips.  Usually, it should be empty.

       "pmake"
           From Loc.U:




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           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "pr"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "prefix"
           From prefix.U:

           This variable holds the name of the directory below
           which the user will install the package.  Usually,
           this is /usr/local, and executables go in
           /usr/local/bin, library stuff in /usr/local/lib, man
           pages in /usr/local/man, etc.  It is only used to set
           defaults for things in bin.U, mansrc.U, privlib.U, or
           scriptdir.U.

       "prefixexp"
           From prefix.U:

           This variable holds the full absolute path of the
           directory below which the user will install the
           package.  Derived from prefix.

       "privlib"
           From privlib.U:

           This variable contains the eventual value of the
           "PRIVLIB" symbol, which is the name of the private
           library for this package.  It may have a ~ on the
           front. It is up to the makefile to eventually create
           this directory while performing installation (with ~
           substitution).

       "privlibexp"
           From privlib.U:

           This variable is the ~name expanded version of
           privlib, so that you may use it directly in Makefiles
           or shell scripts.

       "procselfexe"
           From d_procselfexe.U:

           If d_procselfexe is defined, $procselfexe is the
           filename of the symbolic link pointing to the absolute
           pathname of the executing program.

       "prototype"
           From prototype.U:




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           This variable holds the eventual value of
           "CAN_PROTOTYPE", which indicates the C compiler can
           handle funciton prototypes.

       "ptrsize"
           From ptrsize.U:

           This variable contains the value of the "PTRSIZE"
           symbol, which indicates to the C program how many
           bytes there are in a pointer.

   q
       "quadkind"
           From quadtype.U:

           This variable, if defined, encodes the type of a quad:
           1 = int, 2 = long, 3 = long long, 4 = int64_t.

       "quadtype"
           From quadtype.U:

           This variable defines Quad_t to be something like
           long, int, long long, int64_t, or whatever type is
           used for 64-bit integers.

   r
       "randbits"
           From randfunc.U:

           Indicates how many bits are produced by the function
           used to generate normalized random numbers.

       "randfunc"
           From randfunc.U:

           Indicates the name of the random number function to
           use.  Values include drand48, random, and rand. In C
           programs, the "Drand01" macro is defined to generate
           uniformly distributed random numbers over the range
           [0., 1.[ (see drand01 and nrand).

       "random_r_proto"
           From d_random_r.U:

           This variable encodes the prototype of random_r.  It
           is zero if d_random_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_random_r is defined.

       "randseedtype"
           From randfunc.U:

           Indicates the type of the argument of the seedfunc.




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       "ranlib"
           From orderlib.U:

           This variable is set to the pathname of the ranlib
           program, if it is needed to generate random libraries.
           Set to ":" if ar can generate random libraries or if
           random libraries are not supported

       "rd_nodata"
           From nblock_io.U:

           This variable holds the return code from read() when
           no data is present. It should be -1, but some systems
           return 0 when "O_NDELAY" is used, which is a shame
           because you cannot make the difference between no data
           and an EOF.. Sigh!

       "readdir64_r_proto"
           From d_readdir64_r.U:

           This variable encodes the prototype of readdir64_r.
           It is zero if d_readdir64_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_readdir64_r is defined.

       "readdir_r_proto"
           From d_readdir_r.U:

           This variable encodes the prototype of readdir_r.  It
           is zero if d_readdir_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_readdir_r is defined.

       "revision"
           From patchlevel.U:

           The value of revision comes from the patchlevel.h
           file.  In a version number such as 5.6.1, this is the
           5.  In patchlevel.h, this is referred to as
           "PERL_REVISION".

       "rm"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the rm
           program.  After Configure runs, the value is reset to
           a plain "rm" and is not useful.

       "rm_try"
           From Unix.U:

           This is a cleanup variable for try test programs.
           Internal Configure use only.



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       "rmail"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "run"
           From Cross.U:

           This variable contains the command used by Configure
           to copy and execute a cross-compiled executable in the
           target host.  Useful and available only during Perl
           build.  Empty string '' if not cross-compiling.

       "runnm"
           From usenm.U:

           This variable contains "true" or "false" depending
           whether the nm extraction should be performed or not,
           according to the value of usenm and the flags on the
           Configure command line.

   s
       "sched_yield"
           From d_pthread_y.U:

           This variable defines the way to yield the execution
           of the current thread.

       "scriptdir"
           From scriptdir.U:

           This variable holds the name of the directory in which
           the user wants to put publicly scripts for the package
           in question.  It is either the same directory as for
           binaries, or a special one that can be mounted across
           different architectures, like /usr/share. Programs
           must be prepared to deal with ~name expansion.

       "scriptdirexp"
           From scriptdir.U:

           This variable is the same as scriptdir, but is
           filename expanded at configuration time, for programs
           not wanting to bother with it.

       "sed"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the sed
           program.  After Configure runs, the value is reset to
           a plain "sed" and is not useful.




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       "seedfunc"
           From randfunc.U:

           Indicates the random number generating seed function.
           Values include srand48, srandom, and srand.

       "selectminbits"
           From selectminbits.U:

           This variable holds the minimum number of bits
           operated by select.  That is, if you do select(n,
           ...), how many bits at least will be cleared in the
           masks if some activity is detected.  Usually this is
           either n or 32*ceil(n/32), especially many little-
           endians do the latter.  This is only useful if you
           have select(), naturally.

       "selecttype"
           From selecttype.U:

           This variable holds the type used for the 2nd, 3rd,
           and 4th arguments to select.  Usually, this is "fd_set
           *", if "HAS_FD_SET" is defined, and "int *" otherwise.
           This is only useful if you have select(), naturally.

       "sendmail"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "setgrent_r_proto"
           From d_setgrent_r.U:

           This variable encodes the prototype of setgrent_r.  It
           is zero if d_setgrent_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_setgrent_r is defined.

       "sethostent_r_proto"
           From d_sethostent_r.U:

           This variable encodes the prototype of sethostent_r.
           It is zero if d_sethostent_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_sethostent_r is defined.

       "setlocale_r_proto"
           From d_setlocale_r.U:

           This variable encodes the prototype of setlocale_r.
           It is zero if d_setlocale_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_setlocale_r is defined.



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       "setnetent_r_proto"
           From d_setnetent_r.U:

           This variable encodes the prototype of setnetent_r.
           It is zero if d_setnetent_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_setnetent_r is defined.

       "setprotoent_r_proto"
           From d_setprotoent_r.U:

           This variable encodes the prototype of setprotoent_r.
           It is zero if d_setprotoent_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_setprotoent_r is defined.

       "setpwent_r_proto"
           From d_setpwent_r.U:

           This variable encodes the prototype of setpwent_r.  It
           is zero if d_setpwent_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_setpwent_r is defined.

       "setservent_r_proto"
           From d_setservent_r.U:

           This variable encodes the prototype of setservent_r.
           It is zero if d_setservent_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_setservent_r is defined.

       "sGMTIME_max"
           From time_size.U:

           This variable defines the maximum value of the time_t
           offset that the system function gmtime () accepts

       "sGMTIME_min"
           From time_size.U:

           This variable defines the minimum value of the time_t
           offset that the system function gmtime () accepts

       "sh"
           From sh.U:

           This variable contains the full pathname of the shell
           used on this system to execute Bourne shell scripts.
           Usually, this will be /bin/sh, though it's possible
           that some systems will have /bin/ksh, /bin/pdksh,
           /bin/ash, /bin/bash, or even something such as
           D:/bin/sh.exe.  This unit comes before Options.U, so
           you can't set sh with a "-D" option, though you can



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           override this (and startsh) with "-O
           -Dsh=/bin/whatever -Dstartsh=whatever"

       "shar"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "sharpbang"
           From spitshell.U:

           This variable contains the string #! if this system
           supports that construct.

       "shmattype"
           From d_shmat.U:

           This symbol contains the type of pointer returned by
           shmat().  It can be "void *" or "char *".

       "shortsize"
           From intsize.U:

           This variable contains the value of the "SHORTSIZE"
           symbol which indicates to the C program how many bytes
           there are in a short.

       "shrpenv"
           From libperl.U:

           If the user builds a shared libperl.so, then we need
           to tell the "perl" executable where it will be able to
           find the installed libperl.so.  One way to do this on
           some systems is to set the environment variable
           "LD_RUN_PATH" to the directory that will be the final
           location of the shared libperl.so.  The makefile can
           use this with something like $shrpenv $("CC") -o perl
           perlmain.o $libperl $libs Typical values are
           shrpenv="env "LD_RUN_PATH"=$archlibexp/"CORE"" or
           shrpenv='' See the main perl Makefile.SH for actual
           working usage.  Alternatively, we might be able to use
           a command line option such as -R $archlibexp/"CORE"
           (Solaris) or -Wl,-rpath $archlibexp/"CORE" (Linux).

       "shsharp"
           From spitshell.U:

           This variable tells further Configure units whether
           your sh can handle # comments.

       "sig_count"
           From sig_name.U:




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           This variable holds a number larger than the largest
           valid signal number.  This is usually the same as the
           "NSIG" macro.

       "sig_name"
           From sig_name.U:

           This variable holds the signal names, space separated.
           The leading "SIG" in signal name is removed.  A "ZERO"
           is prepended to the list.  This is currently not used,
           sig_name_init is used instead.

       "sig_name_init"
           From sig_name.U:

           This variable holds the signal names, enclosed in
           double quotes and separated by commas, suitable for
           use in the "SIG_NAME" definition below.  A "ZERO" is
           prepended to the list, and the list is terminated with
           a plain 0.  The leading "SIG" in signal names is
           removed. See sig_num.

       "sig_num"
           From sig_name.U:

           This variable holds the signal numbers, space
           separated. A "ZERO" is prepended to the list
           (corresponding to the fake "SIGZERO").  Those numbers
           correspond to  the value of the signal listed in the
           same place within the sig_name list.  This is
           currently not used, sig_num_init is used instead.

       "sig_num_init"
           From sig_name.U:

           This variable holds the signal numbers, enclosed in
           double quotes and separated by commas, suitable for
           use in the "SIG_NUM" definition below.  A "ZERO" is
           prepended to the list, and the list is terminated with
           a plain 0.

       "sig_size"
           From sig_name.U:

           This variable contains the number of elements of the
           sig_name and sig_num arrays.

       "signal_t"
           From d_voidsig.U:

           This variable holds the type of the signal handler
           (void or int).





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       "sitearch"
           From sitearch.U:

           This variable contains the eventual value of the
           "SITEARCH" symbol, which is the name of the private
           library for this package.  It may have a ~ on the
           front. It is up to the makefile to eventually create
           this directory while performing installation (with ~
           substitution).  The standard distribution will put
           nothing in this directory.  After perl has been
           installed, users may install their own local
           architecture-dependent modules in this directory with
           MakeMaker Makefile.PL or equivalent.  See "INSTALL"
           for details.

       "sitearchexp"
           From sitearch.U:

           This variable is the ~name expanded version of
           sitearch, so that you may use it directly in Makefiles
           or shell scripts.

       "sitebin"
           From sitebin.U:

           This variable holds the name of the directory in which
           the user wants to put add-on publicly executable files
           for the package in question.  It is most often a local
           directory such as /usr/local/bin. Programs using this
           variable must be prepared to deal with ~name
           substitution.  The standard distribution will put
           nothing in this directory.  After perl has been
           installed, users may install their own local
           executables in this directory with MakeMaker
           Makefile.PL or equivalent.  See "INSTALL" for details.

       "sitebinexp"
           From sitebin.U:

           This is the same as the sitebin variable, but is
           filename expanded at configuration time, for use in
           your makefiles.

       "sitehtml1dir"
           From sitehtml1dir.U:

           This variable contains the name of the directory in
           which site-specific html source pages are to be put.
           It is the responsibility of the Makefile.SH to get the
           value of this into the proper command.  You must be
           prepared to do the ~name expansion yourself.  The
           standard distribution will put nothing in this
           directory.  After perl has been installed, users may
           install their own local html pages in this directory



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           with MakeMaker Makefile.PL or equivalent.  See
           "INSTALL" for details.

       "sitehtml1direxp"
           From sitehtml1dir.U:

           This variable is the same as the sitehtml1dir
           variable, but is filename expanded at configuration
           time, for convenient use in makefiles.

       "sitehtml3dir"
           From sitehtml3dir.U:

           This variable contains the name of the directory in
           which site-specific library html source pages are to
           be put.  It is the responsibility of the Makefile.SH
           to get the value of this into the proper command.  You
           must be prepared to do the ~name expansion yourself.
           The standard distribution will put nothing in this
           directory.  After perl has been installed, users may
           install their own local library html pages in this
           directory with MakeMaker Makefile.PL or equivalent.
           See "INSTALL" for details.

       "sitehtml3direxp"
           From sitehtml3dir.U:

           This variable is the same as the sitehtml3dir
           variable, but is filename expanded at configuration
           time, for convenient use in makefiles.

       "sitelib"
           From sitelib.U:

           This variable contains the eventual value of the
           "SITELIB" symbol, which is the name of the private
           library for this package.  It may have a ~ on the
           front. It is up to the makefile to eventually create
           this directory while performing installation (with ~
           substitution).  The standard distribution will put
           nothing in this directory.  After perl has been
           installed, users may install their own local
           architecture-independent modules in this directory
           with MakeMaker Makefile.PL or equivalent.  See
           "INSTALL" for details.

       "sitelib_stem"
           From sitelib.U:

           This variable is $sitelibexp with any trailing
           version-specific component removed.  The elements in
           inc_version_list (inc_version_list.U) can be tacked
           onto this variable to generate a list of directories
           to search.



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       "sitelibexp"
           From sitelib.U:

           This variable is the ~name expanded version of
           sitelib, so that you may use it directly in Makefiles
           or shell scripts.

       "siteman1dir"
           From siteman1dir.U:

           This variable contains the name of the directory in
           which site-specific manual source pages are to be put.
           It is the responsibility of the Makefile.SH to get the
           value of this into the proper command.  You must be
           prepared to do the ~name expansion yourself.  The
           standard distribution will put nothing in this
           directory.  After perl has been installed, users may
           install their own local man1 pages in this directory
           with MakeMaker Makefile.PL or equivalent.  See
           "INSTALL" for details.

       "siteman1direxp"
           From siteman1dir.U:

           This variable is the same as the siteman1dir variable,
           but is filename expanded at configuration time, for
           convenient use in makefiles.

       "siteman3dir"
           From siteman3dir.U:

           This variable contains the name of the directory in
           which site-specific library man source pages are to be
           put.  It is the responsibility of the Makefile.SH to
           get the value of this into the proper command.  You
           must be prepared to do the ~name expansion yourself.
           The standard distribution will put nothing in this
           directory.  After perl has been installed, users may
           install their own local man3 pages in this directory
           with MakeMaker Makefile.PL or equivalent.  See
           "INSTALL" for details.

       "siteman3direxp"
           From siteman3dir.U:

           This variable is the same as the siteman3dir variable,
           but is filename expanded at configuration time, for
           convenient use in makefiles.

       "siteprefix"
           From siteprefix.U:

           This variable holds the full absolute path of the
           directory below which the user will install add-on



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           packages.  See "INSTALL" for usage and examples.

       "siteprefixexp"
           From siteprefix.U:

           This variable holds the full absolute path of the
           directory below which the user will install add-on
           packages.  Derived from siteprefix.

       "sitescript"
           From sitescript.U:

           This variable holds the name of the directory in which
           the user wants to put add-on publicly executable files
           for the package in question.  It is most often a local
           directory such as /usr/local/bin. Programs using this
           variable must be prepared to deal with ~name
           substitution.  The standard distribution will put
           nothing in this directory.  After perl has been
           installed, users may install their own local scripts
           in this directory with MakeMaker Makefile.PL or
           equivalent.  See "INSTALL" for details.

       "sitescriptexp"
           From sitescript.U:

           This is the same as the sitescript variable, but is
           filename expanded at configuration time, for use in
           your makefiles.

       "sizesize"
           From sizesize.U:

           This variable contains the size of a sizetype in
           bytes.

       "sizetype"
           From sizetype.U:

           This variable defines sizetype to be something like
           size_t, unsigned long, or whatever type is used to
           declare length parameters for string functions.

       "sleep"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "sLOCALTIME_max"
           From time_size.U:

           This variable defines the maximum value of the time_t
           offset that the system function localtime () accepts



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       "sLOCALTIME_min"
           From time_size.U:

           This variable defines the minimum value of the time_t
           offset that the system function localtime () accepts

       "smail"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "so"
           From so.U:

           This variable holds the extension used to identify
           shared libraries (also known as shared objects) on the
           system. Usually set to "so".

       "sockethdr"
           From d_socket.U:

           This variable has any cpp "-I" flags needed for socket
           support.

       "socketlib"
           From d_socket.U:

           This variable has the names of any libraries needed
           for socket support.

       "socksizetype"
           From socksizetype.U:

           This variable holds the type used for the size
           argument for various socket calls like accept.  Usual
           values include socklen_t, size_t, and int.

       "sort"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the sort
           program.  After Configure runs, the value is reset to
           a plain "sort" and is not useful.

       "spackage"
           From package.U:

           This variable contains the name of the package being
           constructed, with the first letter uppercased, i.e.
           suitable for starting sentences.





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       "spitshell"
           From spitshell.U:

           This variable contains the command necessary to spit
           out a runnable shell on this system.  It is either cat
           or a grep "-v" for # comments.

       "sPRId64"
           From quadfio.U:

           This variable, if defined, contains the string used by
           stdio to format 64-bit decimal numbers (format "d")
           for output.

       "sPRIeldbl"
           From longdblfio.U:

           This variable, if defined, contains the string used by
           stdio to format long doubles (format "e") for output.

       "sPRIEUldbl"
           From longdblfio.U:

           This variable, if defined, contains the string used by
           stdio to format long doubles (format "E") for output.
           The "U" in the name is to separate this from sPRIeldbl
           so that even case-blind systems can see the
           difference.

       "sPRIfldbl"
           From longdblfio.U:

           This variable, if defined, contains the string used by
           stdio to format long doubles (format "f") for output.

       "sPRIFUldbl"
           From longdblfio.U:

           This variable, if defined, contains the string used by
           stdio to format long doubles (format "F") for output.
           The "U" in the name is to separate this from sPRIfldbl
           so that even case-blind systems can see the
           difference.

       "sPRIgldbl"
           From longdblfio.U:

           This variable, if defined, contains the string used by
           stdio to format long doubles (format "g") for output.

       "sPRIGUldbl"
           From longdblfio.U:

           This variable, if defined, contains the string used by



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           stdio to format long doubles (format "G") for output.
           The "U" in the name is to separate this from sPRIgldbl
           so that even case-blind systems can see the
           difference.

       "sPRIi64"
           From quadfio.U:

           This variable, if defined, contains the string used by
           stdio to format 64-bit decimal numbers (format "i")
           for output.

       "sPRIo64"
           From quadfio.U:

           This variable, if defined, contains the string used by
           stdio to format 64-bit octal numbers (format "o") for
           output.

       "sPRIu64"
           From quadfio.U:

           This variable, if defined, contains the string used by
           stdio to format 64-bit unsigned decimal numbers
           (format "u") for output.

       "sPRIx64"
           From quadfio.U:

           This variable, if defined, contains the string used by
           stdio to format 64-bit hexadecimal numbers (format
           "x") for output.

       "sPRIXU64"
           From quadfio.U:

           This variable, if defined, contains the string used by
           stdio to format 64-bit hExADECimAl numbers (format
           "X") for output.  The "U" in the name is to separate
           this from sPRIx64 so that even case-blind systems can
           see the difference.

       "srand48_r_proto"
           From d_srand48_r.U:

           This variable encodes the prototype of srand48_r.  It
           is zero if d_srand48_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_srand48_r is defined.

       "srandom_r_proto"
           From d_srandom_r.U:

           This variable encodes the prototype of srandom_r.  It



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           is zero if d_srandom_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_srandom_r is defined.

       "src"
           From src.U:

           This variable holds the (possibly relative) path of
           the package source.  It is up to the Makefile to use
           this variable and set "VPATH" accordingly to find the
           sources remotely.  Use $pkgsrc to have an absolute
           path.

       "sSCNfldbl"
           From longdblfio.U:

           This variable, if defined, contains the string used by
           stdio to format long doubles (format "f") for input.

       "ssizetype"
           From ssizetype.U:

           This variable defines ssizetype to be something like
           ssize_t, long or int.  It is used by functions that
           return a count of bytes or an error condition.  It
           must be a signed type.  We will pick a type such that
           sizeof(SSize_t) == sizeof(Size_t).

       "startperl"
           From startperl.U:

           This variable contains the string to put on the front
           of a perl script to make sure (hopefully) that it runs
           with perl and not some shell. Of course, that leading
           line must be followed by the classical perl idiom:
           eval 'exec perl -S $0 ${1+$@}' if
           $running_under_some_shell; to guarantee perl startup
           should the shell execute the script. Note that this
           magic incatation is not understood by csh.

       "startsh"
           From startsh.U:

           This variable contains the string to put on the front
           of a shell script to make sure (hopefully) that it
           runs with sh and not some other shell.

       "static_ext"
           From Extensions.U:

           This variable holds a list of "XS" extension files we
           want to link statically into the package.  It is used
           by Makefile.




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       "stdchar"
           From stdchar.U:

           This variable conditionally defines "STDCHAR" to be
           the type of char used in stdio.h.  It has the values
           "unsigned char" or "char".

       "stdio_base"
           From d_stdstdio.U:

           This variable defines how, given a "FILE" pointer, fp,
           to access the _base field (or equivalent) of stdio.h's
           "FILE" structure.  This will be used to define the
           macro FILE_base(fp).

       "stdio_bufsiz"
           From d_stdstdio.U:

           This variable defines how, given a "FILE" pointer, fp,
           to determine the number of bytes store in the I/O
           buffer pointer to by the _base field (or equivalent)
           of stdio.h's "FILE" structure.  This will be used to
           define the macro FILE_bufsiz(fp).

       "stdio_cnt"
           From d_stdstdio.U:

           This variable defines how, given a "FILE" pointer, fp,
           to access the _cnt field (or equivalent) of stdio.h's
           "FILE" structure.  This will be used to define the
           macro FILE_cnt(fp).

       "stdio_filbuf"
           From d_stdstdio.U:

           This variable defines how, given a "FILE" pointer, fp,
           to tell stdio to refill its internal buffers (?).
           This will be used to define the macro FILE_filbuf(fp).

       "stdio_ptr"
           From d_stdstdio.U:

           This variable defines how, given a "FILE" pointer, fp,
           to access the _ptr field (or equivalent) of stdio.h's
           "FILE" structure.  This will be used to define the
           macro FILE_ptr(fp).

       "stdio_stream_array"
           From stdio_streams.U:

           This variable tells the name of the array holding the
           stdio streams.  Usual values include _iob, __iob, and
           __sF.




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       "strerror_r_proto"
           From d_strerror_r.U:

           This variable encodes the prototype of strerror_r.  It
           is zero if d_strerror_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_strerror_r is defined.

       "strings"
           From i_string.U:

           This variable holds the full path of the string header
           that will be used. Typically /usr/include/string.h or
           /usr/include/strings.h.

       "submit"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "subversion"
           From patchlevel.U:

           The subversion level of this package.  The value of
           subversion comes from the patchlevel.h file.  In a
           version number such as 5.6.1, this is the 1.  In
           patchlevel.h, this is referred to as
           "PERL_SUBVERSION".  This is unique to perl.

       "sysman"
           From sysman.U:

           This variable holds the place where the manual is
           located on this system. It is not the place where the
           user wants to put his manual pages. Rather it is the
           place where Configure may look to find manual for unix
           commands (section 1 of the manual usually). See
           mansrc.

   t
       "tail"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "tar"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.





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       "targetarch"
           From Cross.U:

           If cross-compiling, this variable contains the target
           architecture.  If not, this will be empty.

       "tbl"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "tee"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "test"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the test
           program.  After Configure runs, the value is reset to
           a plain "test" and is not useful.

       "timeincl"
           From i_time.U:

           This variable holds the full path of the included time
           header(s).

       "timetype"
           From d_time.U:

           This variable holds the type returned by time(). It
           can be long, or time_t on "BSD" sites (in which case
           <sys/types.h> should be included). Anyway, the type
           Time_t should be used.

       "tmpnam_r_proto"
           From d_tmpnam_r.U:

           This variable encodes the prototype of tmpnam_r.  It
           is zero if d_tmpnam_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_tmpnam_r is defined.

       "to"
           From Cross.U:

           This variable contains the command used by Configure
           to copy to from the target host.  Useful and available
           only during Perl build.  The string ":" if not cross-



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           compiling.

       "touch"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the touch
           program.  After Configure runs, the value is reset to
           a plain "touch" and is not useful.

       "tr"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the tr
           program.  After Configure runs, the value is reset to
           a plain "tr" and is not useful.

       "trnl"
           From trnl.U:

           This variable contains the value to be passed to the
           tr(1) command to transliterate a newline.  Typical
           values are "\012" and "\n".  This is needed for
           "EBCDIC" systems where newline is not necessarily
           "\012".

       "troff"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "ttyname_r_proto"
           From d_ttyname_r.U:

           This variable encodes the prototype of ttyname_r.  It
           is zero if d_ttyname_r is undef, and one of the
           "REENTRANT_PROTO_T_ABC" macros of reentr.h if
           d_ttyname_r is defined.

   u
       "u16size"
           From perlxv.U:

           This variable is the size of an U16 in bytes.

       "u16type"
           From perlxv.U:

           This variable contains the C type used for Perl's U16.

       "u32size"
           From perlxv.U:



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           This variable is the size of an U32 in bytes.

       "u32type"
           From perlxv.U:

           This variable contains the C type used for Perl's U32.

       "u64size"
           From perlxv.U:

           This variable is the size of an U64 in bytes.

       "u64type"
           From perlxv.U:

           This variable contains the C type used for Perl's U64.

       "u8size"
           From perlxv.U:

           This variable is the size of an U8 in bytes.

       "u8type"
           From perlxv.U:

           This variable contains the C type used for Perl's U8.

       "uidformat"
           From uidf.U:

           This variable contains the format string used for
           printing a Uid_t.

       "uidsign"
           From uidsign.U:

           This variable contains the signedness of a uidtype.  1
           for unsigned, -1 for signed.

       "uidsize"
           From uidsize.U:

           This variable contains the size of a uidtype in bytes.

       "uidtype"
           From uidtype.U:

           This variable defines Uid_t to be something like
           uid_t, int, ushort, or whatever type is used to
           declare user ids in the kernel.

       "uname"
           From Loc.U:




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           This variable is used internally by Configure to
           determine the full pathname (if any) of the uname
           program.  After Configure runs, the value is reset to
           a plain "uname" and is not useful.

       "uniq"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the uniq
           program.  After Configure runs, the value is reset to
           a plain "uniq" and is not useful.

       "uquadtype"
           From quadtype.U:

           This variable defines Uquad_t to be something like
           unsigned long, unsigned int, unsigned long long,
           uint64_t, or whatever type is used for 64-bit
           integers.

       "use5005threads"
           From usethreads.U:

           This variable conditionally defines the
           USE_5005THREADS symbol, and indicates that Perl should
           be built to use the 5.005-based threading
           implementation. Only valid up to 5.8.x.

       "use64bitall"
           From use64bits.U:

           This variable conditionally defines the USE_64_BIT_ALL
           symbol, and indicates that 64-bit integer types should
           be used when available.  The maximal possible
           64-bitness is employed: LP64 or ILP64, meaning that
           you will be able to use more than 2 gigabytes of
           memory.  This mode is even more binary incompatible
           than USE_64_BIT_INT. You may not be able to run the
           resulting executable in a 32-bit "CPU" at all or you
           may need at least to reboot your "OS" to 64-bit mode.

       "use64bitint"
           From use64bits.U:

           This variable conditionally defines the USE_64_BIT_INT
           symbol, and indicates that 64-bit integer types should
           be used when available.  The minimal possible
           64-bitness is employed, just enough to get 64-bit
           integers into Perl.  This may mean using for example
           "long longs", while your memory may still be limited
           to 2 gigabytes.





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       "usecrosscompile"
           From Cross.U:

           This variable conditionally defines the
           "USE_CROSS_COMPILE" symbol, and indicates that Perl
           has been cross-compiled.

       "usedevel"
           From Devel.U:

           This variable indicates that Perl was configured with
           development features enabled.  This should not be done
           for production builds.

       "usedl"
           From dlsrc.U:

           This variable indicates if the system supports dynamic
           loading of some sort.  See also dlsrc and dlobj.

       "usedtrace"
           From usedtrace.U:

           This variable indicates whether we are compiling with
           dtrace support. See also dtrace.

       "usefaststdio"
           From usefaststdio.U:

           This variable conditionally defines the
           "USE_FAST_STDIO" symbol, and indicates that Perl
           should be built to use "fast stdio".  Defaults to
           define in Perls 5.8 and earlier, to undef later.

       "useithreads"
           From usethreads.U:

           This variable conditionally defines the "USE_ITHREADS"
           symbol, and indicates that Perl should be built to use
           the interpreter-based threading implementation.

       "uselargefiles"
           From uselfs.U:

           This variable conditionally defines the
           "USE_LARGE_FILES" symbol, and indicates that large
           file interfaces should be used when available.

       "uselongdouble"
           From uselongdbl.U:

           This variable conditionally defines the
           "USE_LONG_DOUBLE" symbol, and indicates that long
           doubles should be used when available.



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       "usemallocwrap"
           From mallocsrc.U:

           This variable contains y if we are wrapping malloc to
           prevent integer overflow during size calculations.

       "usemorebits"
           From usemorebits.U:

           This variable conditionally defines the
           "USE_MORE_BITS" symbol, and indicates that explicit
           64-bit interfaces and long doubles should be used when
           available.

       "usemultiplicity"
           From usemultiplicity.U:

           This variable conditionally defines the "MULTIPLICITY"
           symbol, and indicates that Perl should be built to use
           multiplicity.

       "usemymalloc"
           From mallocsrc.U:

           This variable contains y if the malloc that comes with
           this package is desired over the system's version of
           malloc.  People often include special versions of
           malloc for effiency, but such versions are often less
           portable.  See also mallocsrc and mallocobj.  If this
           is "y", then -lmalloc is removed from $libs.

       "usenm"
           From usenm.U:

           This variable contains "true" or "false" depending
           whether the nm extraction is wanted or not.

       "useopcode"
           From Extensions.U:

           This variable holds either "true" or "false" to
           indicate whether the Opcode extension should be used.
           The sole use for this currently is to allow an easy
           mechanism for users to skip the Opcode extension from
           the Configure command line.

       "useperlio"
           From useperlio.U:

           This variable conditionally defines the "USE_PERLIO"
           symbol, and indicates that the PerlIO abstraction
           should be used throughout.





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       "useposix"
           From Extensions.U:

           This variable holds either "true" or "false" to
           indicate whether the "POSIX" extension should be used.
           The sole use for this currently is to allow an easy
           mechanism for hints files to indicate that "POSIX"
           will not compile on a particular system.

       "usereentrant"
           From usethreads.U:

           This variable conditionally defines the
           "USE_REENTRANT_API" symbol, which indicates that the
           thread code may try to use the various _r versions of
           library functions.  This is only potentially
           meaningful if usethreads is set and is very
           experimental, it is not even prompted for.

       "userelocatableinc"
           From bin.U:

           This variable is set to true to indicate that perl
           should relocate @"INC" entries at runtime based on the
           path to the perl binary.  Any @"INC" paths starting
           .../ are relocated relative to the directory
           containing the perl binary, and a logical cleanup of
           the path is then made around the join point (removing
           dir/../ pairs)

       "usesfio"
           From d_sfio.U:

           This variable is set to true when the user agrees to
           use sfio.  It is set to false when sfio is not
           available or when the user explicitely requests not to
           use sfio.  It is here primarily so that command-line
           settings can override the auto-detection of d_sfio
           without running into a "WHOA THERE".

       "useshrplib"
           From libperl.U:

           This variable is set to "true" if the user wishes to
           build a shared libperl, and "false" otherwise.

       "usesitecustomize"
           From d_sitecustomize.U:

           This variable is set to true when the user requires a
           mechanism that allows the sysadmin to add entries to
           @"INC" at runtime.  This variable being set, makes
           perl run $sitelib/sitecustomize.pl at startup.




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       "usesocks"
           From usesocks.U:

           This variable conditionally defines the "USE_SOCKS"
           symbol, and indicates that Perl should be built to use
           "SOCKS".

       "usethreads"
           From usethreads.U:

           This variable conditionally defines the "USE_THREADS"
           symbol, and indicates that Perl should be built to use
           threads.

       "usevendorprefix"
           From vendorprefix.U:

           This variable tells whether the vendorprefix and
           consequently other vendor* paths are in use.

       "usevfork"
           From d_vfork.U:

           This variable is set to true when the user accepts to
           use vfork.  It is set to false when no vfork is
           available or when the user explicitely requests not to
           use vfork.

       "usrinc"
           From usrinc.U:

           This variable holds the path of the include files,
           which is usually /usr/include. It is mainly used by
           other Configure units.

       "uuname"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "uvoformat"
           From perlxvf.U:

           This variable contains the format string used for
           printing a Perl "UV" as an unsigned octal integer.

       "uvsize"
           From perlxv.U:

           This variable is the size of a "UV" in bytes.

       "uvtype"
           From perlxv.U:



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           This variable contains the C type used for Perl's
           "UV".

       "uvuformat"
           From perlxvf.U:

           This variable contains the format string used for
           printing a Perl "UV" as an unsigned decimal integer.

       "uvxformat"
           From perlxvf.U:

           This variable contains the format string used for
           printing a Perl "UV" as an unsigned hexadecimal
           integer in lowercase abcdef.

       "uvXUformat"
           From perlxvf.U:

           This variable contains the format string used for
           printing a Perl "UV" as an unsigned hexadecimal
           integer in uppercase "ABCDEF".

   v
       "vendorarch"
           From vendorarch.U:

           This variable contains the value of the
           "PERL_VENDORARCH" symbol.  It may have a ~ on the
           front.  The standard distribution will put nothing in
           this directory.  Vendors who distribute perl may wish
           to place their own architecture-dependent modules and
           extensions in this directory with MakeMaker
           Makefile.PL "INSTALLDIRS"=vendor or equivalent.  See
           "INSTALL" for details.

       "vendorarchexp"
           From vendorarch.U:

           This variable is the ~name expanded version of
           vendorarch, so that you may use it directly in
           Makefiles or shell scripts.

       "vendorbin"
           From vendorbin.U:

           This variable contains the eventual value of the
           "VENDORBIN" symbol.  It may have a ~ on the front.
           The standard distribution will put nothing in this
           directory.  Vendors who distribute perl may wish to
           place additional binaries in this directory with
           MakeMaker Makefile.PL "INSTALLDIRS"=vendor or
           equivalent.  See "INSTALL" for details.




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       "vendorbinexp"
           From vendorbin.U:

           This variable is the ~name expanded version of
           vendorbin, so that you may use it directly in
           Makefiles or shell scripts.

       "vendorhtml1dir"
           From vendorhtml1dir.U:

           This variable contains the name of the directory for
           html pages.  It may have a ~ on the front.  The
           standard distribution will put nothing in this
           directory.  Vendors who distribute perl may wish to
           place their own html pages in this directory with
           MakeMaker Makefile.PL "INSTALLDIRS"=vendor or
           equivalent.  See "INSTALL" for details.

       "vendorhtml1direxp"
           From vendorhtml1dir.U:

           This variable is the ~name expanded version of
           vendorhtml1dir, so that you may use it directly in
           Makefiles or shell scripts.

       "vendorhtml3dir"
           From vendorhtml3dir.U:

           This variable contains the name of the directory for
           html library pages.  It may have a ~ on the front.
           The standard distribution will put nothing in this
           directory.  Vendors who distribute perl may wish to
           place their own html pages for modules and extensions
           in this directory with MakeMaker Makefile.PL
           "INSTALLDIRS"=vendor or equivalent.  See "INSTALL" for
           details.

       "vendorhtml3direxp"
           From vendorhtml3dir.U:

           This variable is the ~name expanded version of
           vendorhtml3dir, so that you may use it directly in
           Makefiles or shell scripts.

       "vendorlib"
           From vendorlib.U:

           This variable contains the eventual value of the
           "VENDORLIB" symbol, which is the name of the private
           library for this package.  The standard distribution
           will put nothing in this directory.  Vendors who
           distribute perl may wish to place their own modules in
           this directory with MakeMaker Makefile.PL
           "INSTALLDIRS"=vendor or equivalent.  See "INSTALL" for



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           details.

       "vendorlib_stem"
           From vendorlib.U:

           This variable is $vendorlibexp with any trailing
           version-specific component removed.  The elements in
           inc_version_list (inc_version_list.U) can be tacked
           onto this variable to generate a list of directories
           to search.

       "vendorlibexp"
           From vendorlib.U:

           This variable is the ~name expanded version of
           vendorlib, so that you may use it directly in
           Makefiles or shell scripts.

       "vendorman1dir"
           From vendorman1dir.U:

           This variable contains the name of the directory for
           man1 pages.  It may have a ~ on the front.  The
           standard distribution will put nothing in this
           directory.  Vendors who distribute perl may wish to
           place their own man1 pages in this directory with
           MakeMaker Makefile.PL "INSTALLDIRS"=vendor or
           equivalent.  See "INSTALL" for details.

       "vendorman1direxp"
           From vendorman1dir.U:

           This variable is the ~name expanded version of
           vendorman1dir, so that you may use it directly in
           Makefiles or shell scripts.

       "vendorman3dir"
           From vendorman3dir.U:

           This variable contains the name of the directory for
           man3 pages.  It may have a ~ on the front.  The
           standard distribution will put nothing in this
           directory.  Vendors who distribute perl may wish to
           place their own man3 pages in this directory with
           MakeMaker Makefile.PL "INSTALLDIRS"=vendor or
           equivalent.  See "INSTALL" for details.

       "vendorman3direxp"
           From vendorman3dir.U:

           This variable is the ~name expanded version of
           vendorman3dir, so that you may use it directly in
           Makefiles or shell scripts.




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       "vendorprefix"
           From vendorprefix.U:

           This variable holds the full absolute path of the
           directory below which the vendor will install add-on
           packages.  See "INSTALL" for usage and examples.

       "vendorprefixexp"
           From vendorprefix.U:

           This variable holds the full absolute path of the
           directory below which the vendor will install add-on
           packages.  Derived from vendorprefix.

       "vendorscript"
           From vendorscript.U:

           This variable contains the eventual value of the
           "VENDORSCRIPT" symbol.  It may have a ~ on the front.
           The standard distribution will put nothing in this
           directory.  Vendors who distribute perl may wish to
           place additional executable scripts in this directory
           with MakeMaker Makefile.PL "INSTALLDIRS"=vendor or
           equivalent.  See "INSTALL" for details.

       "vendorscriptexp"
           From vendorscript.U:

           This variable is the ~name expanded version of
           vendorscript, so that you may use it directly in
           Makefiles or shell scripts.

       "version"
           From patchlevel.U:

           The full version number of this package, such as 5.6.1
           (or 5_6_1).  This combines revision, patchlevel, and
           subversion to get the full version number, including
           any possible subversions.  This is suitable for use as
           a directory name, and hence is filesystem dependent.

       "version_patchlevel_string"
           From patchlevel.U:

           This is a string combining version, subversion and
           perl_patchlevel (if perl_patchlevel is non-zero).  It
           is typically something like 'version 7 subversion 1'
           or 'version 7 subversion 1 patchlevel 11224' It is
           computed here to avoid duplication of code in
           myconfig.SH and lib/Config.pm.

       "versiononly"
           From versiononly.U:




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           If set, this symbol indicates that only the version-
           specific components of a perl installation should be
           installed.  This may be useful for making a test
           installation of a new version without disturbing the
           existing installation.  Setting versiononly is
           equivalent to setting installperl's -v option.  In
           particular, the non-versioned scripts and programs
           such as a2p, c2ph, h2xs, pod2*, and perldoc are not
           installed (see "INSTALL" for a more complete list).
           Nor are the man pages installed.  Usually, this is
           undef.

       "vi"
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "voidflags"
           From voidflags.U:

           This variable contains the eventual value of the
           "VOIDFLAGS" symbol, which indicates how much support
           of the void type is given by this compiler.  See
           "VOIDFLAGS" for more info.

   x
       "xlibpth"
           From libpth.U:

           This variable holds extra path (space-separated) used
           to find libraries on this platform, for example
           "CPU"-specific libraries (on multi-"CPU" platforms)
           may be listed here.

   y
       "yacc"
           From yacc.U:

           This variable holds the name of the compiler compiler
           we want to use in the Makefile. It can be yacc, byacc,
           or bison -y.

       "yaccflags"
           From yacc.U:

           This variable contains any additional yacc flags
           desired by the user.  It is up to the Makefile to use
           this.

   z
       "zcat"
           From Loc.U:




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           This variable is defined but not used by Configure.
           The value is the empty string and is not useful.

       "zip"
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the zip
           program.  After Configure runs, the value is reset to
           a plain "zip" and is not useful.

GIT DATA
       Information on the git commit from which the current perl
       binary was compiled can be found in the variable
       $Config::Git_Data.  The variable is a structured string
       that looks something like this:

         git_commit_id='ea0c2dbd5f5ac6845ecc7ec6696415bf8e27bd52'
         git_describe='GitLive-blead-1076-gea0c2db'
         git_branch='smartmatch'
         git_uncommitted_changes=''
         git_commit_id_title='Commit id:'
         git_commit_date='2009-05-09 17:47:31 +0200'

       Its format is not guaranteed not to change over time.

NOTE
       This module contains a good example of how to use tie to
       implement a cache and an example of how to make a tied
       variable readonly to those outside of it.



























perl v5.10.1                2010-03-17                        153


