


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


NAME
       Config - access Perl configuration information

SYNOPSIS
           use Config;
           if ($Config{'cc'} =~ /gcc/) {
               print "built by gcc\n";
           }

           use Config qw(myconfig config_sh config_vars);

           print myconfig();

           print config_sh();

           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 Con-
       figure) 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.

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

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

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

             name='value';

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

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



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           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{installarch-
       lib}) 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)

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 documenta-
       tion in such cases.







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       _


       ""_a""
           From Unix.U:

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

       ""_exe""
           From Unix.U:

           This variable defines the extension used for exe-
           cutable files.  For unix it is empty.  Other possible
           values include .exe.

       ""_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 com-
           mand line option, but you'd better know what you are
           doing.

       ""alignbytes""
           From alignbytes.U:

           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:




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           This variable contains the command which can be used
           to compute the host name. The command is fully quali-
           fied 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 num-
           ber, like 5.00563.

                   F<perl.c>:incpush() and F<lib/lib.pm> will automatically search in

                   $F<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 C<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 F<inc_version_list.U>.

                   C<XXX> To do:  Since compatibility can depend on compile time

                   options (such as bincompat, longlong, F<etc.>) it should
           (perhaps) be set by Configure, but currently it isn't.
           Currently, we read a hard-wired value from F<patchlevel.h>.
           Perhaps what we ought to do is take the hard-wired value from
           F<patchlevel.h> but then modify it if the current Configure
           options warrant.  F<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
           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



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           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 pro-
           gram.  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 expan-
           sion.

       ""archlibexp""
           From archlib.U:

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

       ""archname64""
           From use64bits.U:

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

       ""archname""
           From archname.U:

           This variable is a short name to characterize the cur-
           rent architecture.  It is used mainly to construct the
           default archlib.

       ""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



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           include emulations of unix calls or other facilities.
           For perl on OS/2, for example, this would include
           os2/os2.obj.

       ""awk""
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the awk pro-
           gram.  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 a plain '' 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
           variable must be prepared to deal with ~name substitu-
           tion.

       ""bincompat5005""
           From bincompat5005.U:

           This variable contains y if this version of Perl
           should be binary-compatible with Perl 5.005.

       ""binexp""
           From bin.U:

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

       ""bison""
           From Loc.U:

           This variable is defined but not used by Configure.



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           The value is a plain '' 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 pro-
           gram.  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 the following,
           larger digits indicate more significance.  The vari-
           able 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.  Other-
           wise 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 difficul-
           ties 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 argu-
           ment expression list

       ""cat""
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the cat pro-
           gram.  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 refer-
           ences that happen to have the same name.  Usual values
           are "cc" and "gcc".  Fervent "ANSI" compilers may be



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           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".

       ""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:




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           This can set either by hints files or by Configure.
           If using a (non-gcc) vendor cc, this variable may con-
           tain 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 Config-
           ure. 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 con-
           figuration file was produced. This is used to tag both
           config.sh and config_h.SH.

       ""charsize""
           From charsize.U:

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

       ""chgrp""
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is a plain '' and is not useful.

       ""chmod""
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is a plain '' and is not useful.

       ""chown""
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is a plain '' and is not useful.

       ""clocktype""
           From d_times.U:

           This variable holds the type returned by times(). It



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           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 pro-
           gram.  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 a plain '' and is not useful.

       C


       ""CONFIGDOTSH""
           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.

       ""contains""
           From contains.U:

           This variable holds the command to do a grep with a
           proper return status.  On most sane systems it is sim-
           ply "grep".  On insane systems it is a grep followed
           by a cat followed by a test.  This variable is primar-
           ily 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 pro-
           gram.  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 a plain '' and is not useful.

       ""cpp""
           From Loc.U:

           This variable is used internally by Configure to



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           determine the full pathname (if any) of the cpp pro-
           gram.  After Configure runs, the value is reset to a
           plain "cpp" and is not useful.

       ""cpp_stuff""
           From cpp_stuff.U:

           This variable contains an identification of the cate-
           nation 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-sepa-
           rated 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 differ-
           ent from the one used by the C compiler. Don't forget
           to append cpplast after the preprocessor options.

       ""cppstdin""
           From cppstdin.U:



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           This variable contains the command which will invoke
           the C preprocessor on standard input and put the out-
           put to stdout.  It is primarily used by other Config-
           ure 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 ccsym-
           bols and cppccsymbols.  The list is a space-separated
           list of symbol=value tokens.

       ""crosscompile""
           From crosscompile.U:

           This variable conditionally defines the "CROSSCOMPILE"
           symbol which signifies that the build process is be a
           cross-compilation.  This is normally set by hints
           files or from Configure command line.

       ""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 pro-
           gram.  After Configure runs, the value is reset to a
           plain "csh" and is not useful.

       d


       ""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.



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       ""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_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_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_attribut""
           From d_attribut.U:

           This variable conditionally defines "HASATTRIBUTE",
           which indicates the C compiler can check for function
           attributes, such as printf formats.

       ""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"



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           symbol if the bcopy() routine is available to copy
           strings.

       ""d_bincompat5005""
           From bincompat5005.U:

           This variable conditionally defines BINCOMPAT5005 so
           that embed.h can take special action if this version
           of Perl should be binary-compatible with Perl 5.005.
           This is impossible for builds that use features like
           threads and multiplicity it is always $undef for those
           versions.

       ""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"
           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_bzero""
           From d_bzero.U:

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

       ""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:

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




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       ""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" sym-
           bol, 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_closedir""
           From d_closedir.U:

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

       ""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_crypt""
           From d_crypt.U:

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

       ""d_csh""
           From d_csh.U:

           This variable conditionally defines the "CSH" symbol,



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           which indicates to the C program that the C-shell
           exists.

       ""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_difftime""
           From d_difftime.U:

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

       ""d_dirnamlen""
           From i_dirent.U:

           This variable conditionally defines "DIRNAMLEN", which
           indicates to the C program that the length of direc-
           tory 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
           calling dlsym().



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       ""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_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 pro-
           gram 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 eac-
           cess() 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 end-
           grent() routine is available for sequential access of
           the group database.

       ""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_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_endpent""
           From d_endpent.U:



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


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

       ""d_endpwent""
           From d_endpwent.U:

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

       ""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_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_fchmod""
           From d_fchmod.U:

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

       ""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



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


           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 com-
           piler 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 com-
           piler 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 indi-
           cator.

       ""d_flexfnam""
           From d_flexfnam.U:

           This variable conditionally defines the "FLEXFILE-
           NAMES" symbol, which indicates that the system sup-
           ports 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.



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


       ""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_fpathconf""
           From d_pathconf.U:

           This variable conditionally defines the "HAS_FPATH-
           CONF" 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_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.

       ""d_fsetpos""
           From d_fsetpos.U:

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

       ""d_fstatfs""
           From d_fstatfs.U:

           This variable conditionally defines the "HAS_FSTATFS"



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


           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_Gconvert""
           From d_gconvert.U:

           This variable holds what Gconvert is defined as to
           convert floating point numbers into strings. It could
           be "gconvert" or a more "complex" macro emulating
           gconvert with gcvt() or sprintf.  Possible values are:
           d_Gconvert="gconvert((x),(n),(t),(b))" d_Gcon-
           vert="gcvt((x),(n),(b))" d_Gcon-
           vert="sprintf((b),%.*g,(n),(x))"

       ""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 work-
           ing directory.

       ""d_getespwnam""
           From d_getespwnam.U:




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           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_GETFS-
           STAT" 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 get-
           grent() routine is available for sequential access of
           the group database.

       ""d_getgrps""
           From d_getgrps.U:

           This variable conditionally defines the "HAS_GET-
           GROUPS" 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_GETHOST-
           BYADDR" 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_GETHOST-
           BYNAME" 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



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

       ""d_gethostprotos""
           From d_gethostprotos.U:

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

       ""d_getlogin""
           From d_getlogin.U:

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

       ""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_GETMN-
           TENT" symbol, which indicates to the C program that
           the getmntent() routine is available to iterate
           through mounted files to get their mount info.

       ""d_getnbyaddr""
           From d_getnbyad.U:

           This variable conditionally defines the "HAS_GETNET-
           BYADDR" 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_GETNETBY-
           NAME" 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:



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

       ""d_getnetprotos""
           From d_getnetprotos.U:

           This variable conditionally defines the "HAS_GET-
           NET_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_GETPROTO-
           BYNAME" 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_GETPROTO-
           BYNUMBER" 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_getpgrp2""
           From d_getpgrp2.U:




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           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_getpgrp""
           From d_getpgrp.U:

           This variable conditionally defines "HAS_GETPGRP" if
           getpgrp() 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 pro-
           cess "ID".

       ""d_getprior""
           From d_getprior.U:

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

       ""d_getprotoprotos""
           From d_getprotoprotos.U:

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

       ""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 get-
           pwent() routine is available for sequential access of
           the passwd database.

       ""d_getsbyname""
           From d_getsrvby.U:




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           This variable conditionally defines the "HAS_GET-
           SERVBYNAME" 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_GET-
           SERVBYPORT" 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:

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

       ""d_getservprotos""
           From d_getservprotos.U:

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

       ""d_getspnam""
           From d_getspnam.U:

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

       ""d_gettimeod""
           From d_ftime.U:

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

       ""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



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           gr_passwd.

       ""d_hasmntopt""
           From d_hasmntopt.U:

           This variable conditionally defines the "HAS_HASMN-
           TOPT" 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_iconv""
           From d_iconv.U:

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

       ""d_index""
           From d_strchr.U:

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

       ""d_inetaton""
           From d_inetaton.U:

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

       ""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 isas-
           cii() is available.

       ""d_isnan""
           From d_isnan.U:



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           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 preci-
           sion number.

       ""d_link""
           From d_link.U:

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

       ""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.





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


       ""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:

           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_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"



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


           symbol, which indicates to the C program that the
           mbtowc() routine is available to convert multibyte to
           a wide character.

       ""d_memchr""
           From d_memchr.U:

           This variable conditionally defines the "HAS_MEMCHR"
           symbol, which indicates to the C program that the mem-
           chr() 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 mem-
           cmp() routine is available to compare blocks of mem-
           ory.

       ""d_memcpy""
           From d_memcpy.U:

           This variable conditionally defines the "HAS_MEMCPY"
           symbol, which indicates to the C program that the mem-
           cpy() 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 mem-
           move() 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 mem-
           set() 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



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


           mkdtemp() routine is available to exclusively create a
           uniquely named temporary directory.

       ""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_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_mprotect""
           From d_mprotect.U:

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




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       ""d_msg""
           From d_msg.U:

           This variable conditionally defines the "HAS_MSG" sym-
           bol, 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_DON-
           TROUTE" symbol, which indicates that the "MSG_DON-
           TROUTE" 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 avail-
           able.  #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 avail-
           able.  #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



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


           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_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.

       ""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_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.

       ""d_nv_preserves_uv""
           From perlxv.U:




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


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

       ""d_nv_preserves_uv_bits""
           From perlxv.U:

           This variable indicates how many of bits type uvtype a
           variable nvtype can preserve.

       ""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_cre-
           ate_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 inter-
           face is based on 4.1c and not 4.2.

       ""d_open3""
           From d_open3.U:

           This variable conditionally defines the HAS_OPEN3 man-
           ifest constant, which indicates to the C program 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-sys-
           tem related limits and options associated with a given



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


           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_OTHERLIB-
           DIRS", 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_PHOST-
           NAME" 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:

           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



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           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 sepa-
           rate this from d_PRIeldbl so that even case-blind sys-
           tems 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 sepa-
           rate this from d_PRIfldbl so that even case-blind sys-
           tems 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:

           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 sepa-
           rate this from d_PRIgldbl so that even case-blind sys-
           tems can see the difference.

       ""d_PRIi64""
           From quadfio.U:




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


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

       ""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_pthread_yield""
           From d_pthread_y.U:

           This variable conditionally defines the
           "HAS_PTHREAD_YIELD" symbol if the pthread_yield rou-
           tine is available to yield the execution of the cur-
           rent 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.




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


       ""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:

           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_readdir""
           From d_readdir.U:

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



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       ""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_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.

       ""d_safebcpy""
           From d_safebcpy.U:

           This variable conditionally defines the
           "HAS_SAFE_BCOPY" symbol if the bcopy() routine can do
           overlapping copies.

       ""d_safemcpy""
           From d_safemcpy.U:

           This variable conditionally defines the "HAS_SAFE_MEM-
           CPY" symbol if the memcpy() routine can do overlapping
           copies.

       ""d_sanemcmp""
           From d_sanemcmp.U:

           This variable conditionally defines the "HAS_SANE_MEM-
           CMP" 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



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


           program that the system provides a prototype for the
           sbrk() function.  Otherwise, it is up to the program
           to supply one.

       ""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
           "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 descrip-
           tors. 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" sym-
           bol, 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



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           semctl() routine is available.

       ""d_semctl_semid_ds""
           From d_union_semun.U:

           This variable conditionally defines "USE_SEM-
           CTL_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_SEM-
           CTL_SEMUN", which indicates that union semun is to be
           used for semctl "IPC_STAT".

       ""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_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 set-
           grent() routine is available for initializing sequen-
           tial access to the group database.




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       ""d_setgrps""
           From d_setgrps.U:

           This variable conditionally defines the "HAS_SET-
           GROUPS" 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_setlinebuf""
           From d_setlnbuf.U:

           This variable conditionally defines the "HAS_SET-
           LINEBUF" 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_setnent""
           From d_setnent.U:

           This variable conditionally defines "HAS_SETNETENT" if
           setnetent() 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_setpgrp2""
           From d_setpgrp2.U:

           This variable conditionally defines the HAS_SETPGRP2
           symbol, which indicates to the C program that the



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


           setpgrp2() (as in DG/"UX") routine is available to set
           the current process group.

       ""d_setpgrp""
           From d_setpgrp.U:

           This variable conditionally defines "HAS_SETPGRP" if
           setpgrp() 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 pri-
           ority.

       ""d_setproctitle""
           From d_setproctitle.U:

           This variable conditionally defines the "HAS_SETPROC-
           TITLE" symbol, which indicates to the C program that
           the setproctitle() 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 set-
           pwent() routine is available for initializing sequen-
           tial access to the passwd database.

       ""d_setregid""
           From d_setregid.U:

           This variable conditionally defines "HAS_SETREGID" if
           setregid() is available to change the real and effec-
           tive 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.





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       ""d_setreuid""
           From d_setreuid.U:

           This variable conditionally defines "HAS_SETREUID" if
           setreuid() is available to change the real and effec-
           tive 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.

       ""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_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"



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


           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
           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 shm-
           ctl() 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_SIGAC-
           TION" symbol, which indicates that the Vr4 sigaction()
           routine is available.

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


           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_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_SOCKET-
           PAIR" symbol, which indicates that the "BSD" socket-
           pair() is supported.

       ""d_socks5_init""
           From d_socks5_init.U:

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

       ""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_statblks""
           From d_statblks.U:

           This variable conditionally defines "USE_STAT_BLOCKS"
           if this system has a stat structure declaring st_blk-
           size 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").



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       ""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:

           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.





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       ""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 col-
           lating 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 struc-
           tures.

       ""d_strerrm""
           From d_strerror.U:

           This variable holds what Strerrr is defined as to
           translate an error code condition into an error mes-
           sage string. It could be "strerror" or a more "com-
           plex" macro emulating strrror with sys_errlist[], or
           the "unknown" string when both strerror and
           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_strtod""
           From d_strtod.U:

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




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       ""d_strtol""
           From d_strtol.U:

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

       ""d_strtold""
           From d_strtold.U:

           This variable conditionally defines the "HAS_STRTOLD"
           symbol, which indicates to the C program that the str-
           told() 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 str-
           toll() 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 str-
           toq() 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 str-
           toul() 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 str-
           toull() 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 str-
           touq() routine is available.

       ""d_strxfrm""
           From d_strxfrm.U:




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           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
           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 sym-
           link() 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_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_ERRNO-
           LIST" 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 num-
           bers to strings.

       ""d_system""
           From d_system.U:

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

       ""d_tcgetpgrp""
           From d_tcgtpgrp.U:




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           This variable conditionally defines the "HAS_TCGETP-
           GRP" 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_TCSETP-
           GRP" 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 pro-
           gram 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_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>.

       ""d_truncate""
           From d_truncate.U:

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

       ""d_tzname""
           From d_tzname.U:

           This variable conditionally defines "HAS_TZNAME" if



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           tzname[] is available to access timezone names.

       ""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_ustat""
           From d_ustat.U:

           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_vfork""
           From d_vfork.U:

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





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       ""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 (*sig-
           nal(...))()".

       ""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().

       ""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_wait4""
           From d_wait4.U:

           This variable conditionally defines the HAS_WAIT4 sym-
           bol, 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"



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           symbol, which indicates to the C program that the
           wcstombs() routine is available to convert wide char-
           acter 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 char-
           acter to a multibyte.

       ""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 pro-
           gram.  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 struc-
           ture element in the <db.h> header file.  In older ver-
           sions of "DB", it was int, while in newer ones it is
           size_t.

       ""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



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           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 gen-
           eraties.

       ""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 (dou-
           ble) (((unsigned long) 1 << randbits)) in order to
           normalize the result.  In C programs, the macro
           "Drand01" is mapped to drand01.

       ""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



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           system uses "EBCDIC" encoding.  Among other things,
           this means that the character ranges are not contigu-
           ous.  See trnl.U

       ""echo""
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the echo pro-
           gram.  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 pro-
           gram.  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 a plain '' and is not useful.

       ""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:

           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 pro-
           gram.  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.



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       f


       ""fflushall""
           From fflushall.U:

           This symbol, if defined, tells that to flush all pend-
           ing 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 a plain '' and is not useful.

       ""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 a plain '' 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:



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

       ""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".
           This is only used in the compiled C program, and we
           assume that all systems which can share this exe-
           cutable 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 exe-
           cutable will have the same full pathname to sed.

       g


       ""gccosandvers""
           From gccvers.U:

           If "GNU" cc (gcc) is used, this variable the operating
           system and version used to compile the 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.

       ""gidformat""
           From gidf.U:

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





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       ""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.

       ""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.

       ""grep""
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the grep pro-
           gram.  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
           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().  Usu-
           ally, this is the same as gidtype (gid_t), but some-
           times it isn't.




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       ""gzip""
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the gzip pro-
           gram.  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.

       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:



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           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.

       ""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_bsdioctl""
           From i_sysioctl.U:

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

       ""i_db""
           From i_db.U:

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

       ""i_dbm""
           From i_dbm.U:

           This variable conditionally defines the "I_DBM" sym-
           bol, which indicates to the C program that <dbm.h>



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           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" sym-
           bol, 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" sym-
           bol, 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" sym-
           bol, 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_gdbm""
           From i_gdbm.U:

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

       ""i_grp""
           From i_grp.U:

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

       ""i_iconv""
           From i_iconv.U:




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           This variable conditionally defines the "I_ICONV" sym-
           bol, and indicates whether a C program should include
           <iconv.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_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>.





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       ""i_math""
           From i_math.U:

           This variable conditionally defines the "I_MATH" sym-
           bol, 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
           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" sym-
           bol, 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" sym-
           bol, 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 pro-
           gram 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



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           include <netinet/in.h>. Otherwise, you may try
           <sys/in.h>.

       ""i_poll""
           From i_poll.U:

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

       ""i_prot""
           From i_prot.U:

           This variable conditionally defines the "I_PROT" sym-
           bol, 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" sym-
           bol, and indicates whether a C program should include
           <sfio.h>.

       ""i_sgtty""
           From i_termio.U:

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





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       ""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" sym-
           bol, and indicates whether a C program should include
           <socks.h>.

       ""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 <std-
           def.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



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           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
           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 prefer-
           ence 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:



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           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:

           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_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_SECU-
           RITY" 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>.




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       ""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>.

       ""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_KER-
           NEL", 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



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           include <sys/uio.h>.

       ""i_sysun""
           From i_sysun.U:

           This variable conditionally defines "I_SYS_UN", which
           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:




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

       ""i_ustat""
           From i_ustat.U:

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

       ""i_utime""
           From i_utime.U:

           This variable conditionally defines the "I_UTIME" sym-
           bol, 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" sym-
           bol, 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).





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       ""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 auto-
           matically search when adding directories to @"INC".
           The elements in the list are separated by spaces.
           This is only useful if you have a perl library direc-
           tory 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 low-
           est possible value.

       ""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 sepa-
           rated 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 $inc-
           path/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 a plain '' and is not useful.

       ""installarchlib""
           From archlib.U:

           This variable is really the same as archlibexp but may
           differ on those systems using "AFS". For extra porta-
           bility, only this variable should be used in make-
           files.

       ""installbin""
           From bin.U:

           This variable is the same as binexp unless "AFS" is
           running in which case the user is explicitely prompted
           for it. This variable should always be used in your
           makefiles for maximum portability.

       ""installman1dir""
           From man1dir.U:

           This variable is really the same as man1direxp, unless



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           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 make-
           files.

       ""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 make-
           files.

       ""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:

           This variable holds the full absolute path of install-
           prefix 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 porta-
           bility, only this variable should be used in make-
           files.

       ""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



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           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.

       ""installsitelib""
           From sitelib.U:

           This variable is really the same as sitelibexp but may
           differ on those systems using "AFS". For extra porta-
           bility, only this variable should be used in make-
           files.

       ""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 Con-
           fig.pm.  Currently, there are only two styles:  "lib"
           and lib/perl5.  The default library locations (e.g.
           privlib, sitelib) are either $prefix/lib or $pre-
           fix/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.

                   This may later be extended to include other information, so

                   be careful with pattern-matching on the results.

                   For compatibility with F<perl5.005> and earlier, the default

                   setting is based on whether or not $prefix contains the string
           C<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:




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           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.

       ""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.

       ""intsize""
           From intsize.U:

           This variable contains the value of the "INTSIZE" sym-
           bol, 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".

       ""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".






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       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 a plain '' 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 make-
           file 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.

       ""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".



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       ""less""
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the less pro-
           gram.  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 exe-
           cutable 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.

       ""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.




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       ""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 a plain '' and is not useful.

       ""lint""
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is a plain '' and is not useful.

       ""lkflags""
           From ccflags.U:

           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 pro-
           gram.  After Configure runs, the value is reset to a
           plain "ln" and is not useful.




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       ""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"

       ""locincpth""
           From ccflags.U:

           This variable contains a list of additional directo-
           ries 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_DOUBLE-
           SIZE" symbol, which indicates to the C program how
           many bytes there are in a long double, if this system
           supports long doubles.

       ""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 sup-
           ports 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 a plain '' and is not useful.




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       ""lpr""
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is a plain '' 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 pro-
           gram.  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


       ""mail""
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is a plain '' and is not useful.

       ""mailx""
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is a plain '' 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 pro-
           gram.  After Configure runs, the value is reset to a
           plain "make" and is not useful.





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       ""make_set_make""
           From make.U:

           Some versions of "make" set the variable "MAKE".  Oth-
           ers 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 han-
           dles this for you, make_set_make="MAKE=$make"    # if
           it doesn't.  I used 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 conve-
           nient use in makefiles.

       ""man1ext""
           From man1dir.U:



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           This variable contains the extension that the manual
           page should have: one of "n", "l", or "1".  The Make-
           file must supply the ..  See man1dir.

       ""man3dir""
           From man3dir.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.

       ""man3direxp""
           From man3dir.U:

           This variable is the same as the man3dir variable, but
           is filename expanded at configuration time, for conve-
           nient 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 Make-
           file must supply the ..  See man3dir.

       M


       ""Mcc""
           From Loc.U:

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

       ""mips_type""
           From usrinc.U:

           This variable holds the environment type for the mips
           system.  Possible values are "BSD 4.3" and "System V".

       ""mkdir""
           From Loc.U:

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

       ""mmaptype""
           From d_mmap.U:



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           This symbol contains the type of pointer returned by
           mmap() (and simultaneously the type of the first argu-
           ment).  It can be "void *" or "caddr_t".

       ""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 pro-
           gram.  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 a plain '' 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



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           "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
           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.  Other-
           wise 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 assign-
           ment, so that some other means must be used when copy-
           ing is required.  As such systems vary in their provi-
           sion (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 gethost-
           byaddr(), 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.





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       ""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 gethostby-
           name(), naturally.

       ""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(), natu-
           rally.

       ""nm""
           From Loc.U:

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



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       ""nveformat""
           From perlxvf.U:

           This variable contains the format string used for
           printing a Perl "NV" using %e-ish floating point for-
           mat.

       ""nvEUformat""
           From perlxvf.U:

           This variable contains the format string used for
           printing a Perl "NV" using %E-ish floating point for-
           mat.

       ""nvfformat""
           From perlxvf.U:

           This variable confains the format string used for
           printing a Perl "NV" using %f-ish floating point for-
           mat.

       ""nvFUformat""
           From perlxvf.U:

           This variable confains the format string used for
           printing a Perl "NV" using %F-ish floating point for-
           mat.

       ""nvgformat""
           From perlxvf.U:

           This variable contains the format string used for
           printing a Perl "NV" using %g-ish floating point for-
           mat.

       ""nvGUformat""
           From perlxvf.U:

           This variable contains the format string used for
           printing a Perl "NV" using %G-ish floating point for-
           mat.

       ""nvsize""
           From perlxv.U:

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

       ""nvtype""
           From perlxv.U:

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





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       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 block-
           ing 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.

       ""osvers""
           From Oldconfig.U:

           This variable contains the operating system version



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           (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 lit-
           tle 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:

           The patchlevel level of this package.  The value of
           patchlevel comes from the patchlevel.h file.  In a



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           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".

       ""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.

       ""perl""
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is a plain '' and is not useful.

       P


       ""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.

       ""pg""
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the pg pro-
           gram.  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.

       ""pm_apiversion""
           From xs_apiversion.U:

           This variable contains the version of the oldest perl
           compatible with the present perl.  (That is, pure perl
           modules written for $pm_apiversion will still work for
           the current version).  perl.c:incpush() and lib/lib.pm
           will automatically search in $sitelib for older direc-
           tories across major versions back to pm_apiversion.
           This is only useful if you have a perl library



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           directory tree structured like the default one.  The
           versioned site_perl library was introduced in 5.005,
           so that's the default setting for this variable.  It's
           hard to imagine it changing before Perl6.  It is
           included here for symmetry with xs_apiveprsion -- the
           searching algorithms will (presumably) be similar.
           See the "INSTALL" file for how this works.

       ""pmake""
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is a plain '' and is not useful.

       ""pr""
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is a plain '' 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 pack-
           age.  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.



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       ""prototype""
           From prototype.U:

           This variable holds the eventual value of "CAN_PROTO-
           TYPE", which indicates the C compiler can handle
           funciton prototypes.

       ""ptrsize""
           From ptrsize.U:

           This variable contains the value of the "PTRSIZE" sym-
           bol, 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).

       ""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!

       ""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 pro-
           gram.  After Configure runs, the value is reset to a
           plain "rm" and is not useful.

       ""rmail""
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is a plain '' and is not useful.

       ""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



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           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 file-
           name 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 pro-
           gram.  After Configure runs, the value is reset to a
           plain "sed" and is not useful.

       ""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 oper-
           ated 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:



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           This variable is defined but not used by Configure.
           The value is a plain '' and is not useful.

       ""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
           override this (and startsh) with "-O -Dsh=/bin/what-
           ever -Dstartsh=whatever"

       ""shar""
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is a plain '' 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



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           working usage.  Alternatively, we might be able to use
           a command line option such as -R $archlibexp/"CORE"
           (Solaris, NetBSD) 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:

           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""
           From sig_name.U:

           This variable holds the signal names, enclosed in dou-
           ble 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 sepa-
           rated. A "ZERO" is prepended to the list (correspond-
           ing to the fake "SIGZERO"), and the list is terminated
           with a 0.  Those numbers correspond to the value of
           the signal listed in the same place within the
           sig_name list.

       ""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.




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       ""sig_size""
           From sig_name.U:

           This variable contains the number of elements of the
           sig_name and sig_num arrays, excluding the final
           "NULL" entry.

       ""signal_t""
           From d_voidsig.U:

           This variable holds the type of the signal handler
           (void or int).

       ""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 architec-
           ture-dependent modules in this directory with Make-
           Maker 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 substitu-
           tion.  The standard distribution will put nothing in
           this directory.  After perl has been installed, users
           may install their own local executables in this direc-
           tory with MakeMaker Makefile.PL or equivalent.  See
           "INSTALL" for details.

       ""sitebinexp""
           From sitebin.U:

           This is the same as the sitebin variable, but is file-
           name expanded at configuration time, for use in your



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           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 architec-
           ture-independent modules in this directory with Make-
           Maker Makefile.PL or equivalent.  See "INSTALL" for
           details.

       ""sitelib_stem""
           From sitelib.U:

           This variable is $sitelibexp with any trailing ver-
           sion-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.

       ""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.

       ""siteprefix""
           From siteprefix.U:

           This variable holds the full absolute path of the
           directory below which the user will install add-on
           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.

       ""sizesize""
           From sizesize.U:

           This variable contains the size of a sizetype in
           bytes.





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       ""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 a plain '' and is not useful.

       ""smail""
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is a plain '' 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 argu-
           ment for various socket calls like accept.  Usual val-
           ues 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 pro-
           gram.  After Configure runs, the value is reset to a
           plain "sort" and is not useful.





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       ""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.

       ""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 differ-
           ence.

       ""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 differ-
           ence.

       ""sPRIgldbl""
           From longdblfio.U:




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           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
           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 differ-
           ence.

       ""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 (for-
           mat "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.

       ""src""
           From src.U:

           This variable holds the path to the package source. It
           is up to the Makefile to use this variable and set



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           "VPATH" accordingly to find the sources remotely.

       ""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 $run-
           ning_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.

       ""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,



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           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 it's 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.

       ""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.



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           The value is a plain '' 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_SUBVER-
           SION".  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 man-
           src.

       t


       ""tail""
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is a plain '' and is not useful.

       ""tar""
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is a plain '' and is not useful.

       ""tbl""
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is a plain '' and is not useful.

       ""tee""
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is a plain '' 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 pro-
           gram.  After Configure runs, the value is reset to a



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           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.

       ""touch""
           From Loc.U:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the touch pro-
           gram.  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 pro-
           gram.  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 a plain '' and is not useful.

       u


       ""u16size""
           From perlxv.U:

           This variable is the size of an U16 in bytes.



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       ""u16type""
           From perlxv.U:

           This variable contains the C type used for Perl's U16.

       ""u32size""
           From perlxv.U:

           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:



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           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:

           This variable is used internally by Configure to
           determine the full pathname (if any) of the uname pro-
           gram.  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 pro-
           gram.  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 inte-
           gers.

       ""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 implementa-
           tion.

       ""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-bit-
           ness 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 result-
           ing 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



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           be used when available.  The minimal possible 64-bit-
           ness 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.

       ""usedl""
           From dlsrc.U:

           This variable indicates if the system supports dynamic
           loading of some sort.  See also dlsrc and dlobj.

       ""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_DOU-
           BLE" symbol, and indicates that long doubles should be
           used when available.

       ""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



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           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 indi-
           cate whether the Opcode extension should be used.  The
           sole use for this currently is to allow an easy mecha-
           nism 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.

       ""useposix""
           From Extensions.U:

           This variable holds either "true" or "false" to indi-
           cate 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.

       ""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 avail-
           able or when the user explicitely requests not to use
           sfio.  It is here primarily so that command-line set-
           tings can override the auto-detection of d_sfio with-
           out running into a "WHOA THERE".

       ""useshrplib""
           From libperl.U:

           This variable is set to "yes" if the user wishes to
           build a shared libperl, and "no" otherwise.

       ""usesocks""
           From usesocks.U:




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           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 con-
           sequently 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 avail-
           able 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 a plain '' 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:

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



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       ""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 inte-
           ger in lowercase abcdef.

       ""uvXUformat""
           From perlxvf.U:

           This variable contains the format string used for
           printing a Perl "UV" as an unsigned hexadecimal inte-
           ger in uppercase "ABCDEF".

       v


       ""vendorarch""
           From vendorarch.U:

           This variable contains the value of the "PERL_VENDO-
           RARCH" symbol.  It may have a ~ on the front.  The
           standard distribution will put nothing in this direc-
           tory.  Vendors who distribute perl may wish to place
           their own architecture-dependent modules and exten-
           sions 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 vendo-
           rarch, so that you may use it directly in Makefiles or
           shell scripts.

       ""vendorbin""
           From vendorbin.U:

           This variable contains the eventual value of the "VEN-
           DORBIN" symbol.  It may have a ~ on the front.  The
           standard distribution will put nothing in this direc-
           tory.  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 ven-
           dorbin, so that you may use it directly in Makefiles
           or shell scripts.

       ""vendorlib""
           From vendorlib.U:

           This variable contains the eventual value of the "VEN-
           DORLIB" symbol, which is the name of the private
           library for this package.  The standard distribution
           will put nothing in this directory.  Vendors who dis-
           tribute perl may wish to place their own modules in
           this directory with MakeMaker Makefile.PL
           "INSTALLDIRS"=vendor or equivalent.  See "INSTALL" for
           details.

       ""vendorlib_stem""
           From vendorlib.U:

           This variable is $vendorlibexp with any trailing ver-
           sion-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 vendor-
           lib, so that you may use it directly in Makefiles or
           shell scripts.

       ""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.

       ""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



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           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.

       ""versiononly""
           From versiononly.U:

           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 equiva-
           lent to setting installperl's -v option.  In particu-
           lar, 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 a plain '' 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.

       ""xs_apiversion""
           From xs_apiversion.U:

           This variable contains the version of the oldest perl
           binary compatible with the present perl.  perl.c:inc-
           push() and lib/lib.pm will automatically search in
           $sitearch for older directories across major versions
           back to xs_apiversion.  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,



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           so that is the lowest possible value.  Since this can
           depend on compile time options (such as bincompat) it
           is set by Configure.  Other non-default sources of
           potential incompatibility, such as multiplicity,
           threads, debugging, 64bits, sfio, etc., are not
           checked for currently, though in principle we could go
           snooping around in old Config.pm files.

       z


       ""zcat""
           From Loc.U:

           This variable is defined but not used by Configure.
           The value is a plain '' 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 pro-
           gram.  After Configure runs, the value is reset to a
           plain "zip" and is not useful.

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.




























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