


lib::Config(3p)  Perl Programmers Reference Guide lib::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
       Configure) are stored in the readonly-variable %Config,
       indexed by their names.

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

       myconfig()
           Returns a textual summary of the major perl
           configuration 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{installarchlib}) and it checks the perl version
       number when loaded.

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

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






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


       M


       Mcc  From Loc.U:

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

       _


       _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
            executable 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
            command 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. Usual values are 2, 4 and 8.

       ansi2knr
            From ansi2knr.U:

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



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


       aphostname
            From d_gethname.U:

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

       apiversion
            From patchlevel.U:

            This is a number which identifies the lowest version
            of perl to have an API (for XS extensions) compatible
            with the present version.  For example, for 5.005_01,
            the apiversion should be 5.005, since 5.005_01 should
            be binary compatible with 5.005.  This should
            probably be incremented manually somehow, perhaps
            from patchlevel.h.  For now, we'll guess maintenance
            subversions will retain binary compatibility.

       ar   From Loc.U:

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

       archlib
            From archlib.U:

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

       archlibexp
            From archlib.U:

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

       archname
            From archname.U:

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

       archobjs
            From Unix.U:




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


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

       awk  From Loc.U:

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

       b


       baserev
            From baserev.U:

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

       bash From Loc.U:

            This variable is defined but not used by Configure.
            The value is 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 substitution.

       binexp
            From bin.U:

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

       bison
            From Loc.U:

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

       byacc
            From Loc.U:

            This variable is used internally by Configure to



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


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

       byteorder
            From byteorder.U:

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

       c


       c    From n.U:

            This variable contains the \c string if that is what
            causes the echo command to suppress newline.
            Otherwise it is null.  Correct usage is

                    $echo $n "prompt for a question: $c".


       castflags
            From d_castneg.U:

            This variable contains a flag that precise
            difficulties the compiler has casting odd floating
            values to unsigned long:

                    0 = ok

                    1 = couldn't cast < 0

                    2 = couldn't cast >= 0x80000000

                    4 = couldn't cast in argument expression list


       cat  From Loc.U:

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

       cc   From cc.U:

            This variable holds the name of a command to execute
            a C compiler which can resolve multiple global
            references that happen to have the same name.  Usual
            values are cc, Mcc, cc -M, and gcc.



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


       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.

       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.

       cf_by
            From cf_who.U:

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

       cf_email
            From cf_email.U:

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

       cf_time
            From cf_who.U:

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




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


       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
            can be long, or clock_t on BSD sites (in which case
            <sys/types.h> should be included).

       comm From Loc.U:

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

       compress
            From Loc.U:

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

       contains
            From contains.U:

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

       cp   From Loc.U:

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




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


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

       cpp_stuff
            From cpp_stuff.U:

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

       cppflags
            From ccflags.U:

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

       cpplast
            From cppstdin.U:

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

       cppminus
            From cppstdin.U:

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

       cpprun
            From cppstdin.U:

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

       cppstdin
            From cppstdin.U:



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            This variable contains the command which will invoke
            the C preprocessor on standard input and put the
            output to stdout.  It is primarily used by other
            Configure units that ask about preprocessor symbols.

       cppsymbols
            From Cppsym.U:

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

       cppccsymbols
            From Cppsym.U:

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

       cryptlib
            From d_crypt.U:

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

       csh  From Loc.U:

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

       d


       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.

       d_access
            From d_access.U:

            This variable conditionally defines HAS_ACCESS if the
            access() system call is available to check for access



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


            permissions using real IDs.

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

       d_bsd
            From Guess.U:

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

       d_bsdgetpgrp
            From d_getpgrp.U:

            This variable conditionally defines USE_BSD_GETPGRP
            if getpgrp needs one arguments whereas USG one needs
            none.

       d_bsdsetpgrp
            From d_setpgrp.U:




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


            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
            memory 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.

       d_charvspr
            From d_vprintf.U:

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

       d_chown
            From d_chown.U:

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

       d_chroot
            From d_chroot.U:

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

       d_chsize
            From d_chsize.U:

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




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       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 symbol,
            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,
            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:




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

       d_dlerror
            From d_dlerror.U:

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

       d_dlopen
            From d_dlopen.U:

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

       d_dlsymun
            From d_dlsymun.U:

            This variable conditionally defines
            DLSYM_NEEDS_UNDERSCORE, which indicates that we need
            to prepend an underscore to the symbol name before
            calling dlsym().

       d_dosuid
            From d_dosuid.U:

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

       d_dup2
            From d_dup2.U:

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

       d_endgrent
            From d_endgrent.U:

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

       d_endhent
            From d_endhent.U:

            This variable conditionally defines HAS_ENDHOSTENT if
            endhostent() is available to close whatever was being



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            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:

            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
            endpwent() 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
            fchmod() routine is available to change mode of
            opened files.





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       d_fchown
            From d_fchown.U:

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

       d_fcntl
            From d_fcntl.U:

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

       d_fd_macros
            From d_fd_set.U:

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

       d_fd_set
            From d_fd_set.U:

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

       d_fds_bits
            From d_fd_set.U:

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

       d_fgetpos
            From d_fgetpos.U:

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

       d_flexfnam
            From d_flexfnam.U:

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



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       d_flock
            From d_flock.U:

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

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

       d_fsetpos
            From d_fsetpos.U:

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

       d_fstatfs
            From d_statfs.U:

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

       d_fstatvfs
            From d_statvfs.U:

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

       d_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_getgrent
            From d_getgrent.U:




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


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

       d_getgrps
            From d_getgrps.U:

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

       d_gethbyaddr
            From d_gethbyad.U:

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

       d_gethbyname
            From d_gethbynm.U:

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

       d_gethent
            From d_gethent.U:

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

       d_gethname
            From d_gethname.U:

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

       d_gethostprotos
            From d_gethostprotos.U:

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





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


       d_getlogin
            From d_getlogin.U:

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

       d_getmntent
            From d_getmntent.U:

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

       d_getnbyaddr
            From d_getnbyad.U:

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

       d_getnbyname
            From d_getnbynm.U:

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

       d_getnent
            From d_getnent.U:

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

       d_getnetprotos
            From d_getnetprotos.U:

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

       d_getpbyname
            From d_getprotby.U:

            This variable conditionally defines the
            HAS_GETPROTOBYNAME symbol, which indicates to the C
            program that the getprotobyname() routine is



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


            available to look up protocols by their name.

       d_getpbynumber
            From d_getprotby.U:

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

       d_getpent
            From d_getpent.U:

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

       d_getpgid
            From d_getpgid.U:

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

       d_getpgrp2
            From d_getpgrp2.U:

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

       d_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
            process ID.

       d_getprior
            From d_getprior.U:

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



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


       d_getprotoprotos
            From d_getprotoprotos.U:

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

       d_getpwent
            From d_getpwent.U:

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

       d_getsbyname
            From d_getsrvby.U:

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

       d_getsbyport
            From d_getsrvby.U:

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

       d_getsent
            From d_getsent.U:

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

       d_getservprotos
            From d_getservprotos.U:

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

       d_gettimeod
            From d_ftime.U:

            This variable conditionally defines the
            HAS_GETTIMEOFDAY symbol, which indicates that the



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


            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
            gr_passwd.

       d_hasmntopt
            From d_hasmntopt.U:

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

       d_htonl
            From d_htonl.U:

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

       d_index
            From d_strchr.U:

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

       d_inetaton
            From d_inetaton.U:

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

       d_isascii
            From d_isascii.U:

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





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


       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_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.

       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_lstat
            From d_lstat.U:

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





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


       d_mblen
            From d_mblen.U:

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

       d_mbstowcs
            From d_mbstowcs.U:

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

       d_mbtowc
            From d_mbtowc.U:

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

       d_memcmp
            From d_memcmp.U:

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

       d_memcpy
            From d_memcpy.U:

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

       d_memmove
            From d_memmove.U:

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

       d_memset
            From d_memset.U:

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



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


            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_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_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_msg
            From d_msg.U:

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

       d_msgctl
            From d_msgctl.U:

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

       d_msgget
            From d_msgget.U:

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

       d_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:




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


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

       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_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 potneially meaningful if
            usethreads is set.

       d_oldsock
            From d_socket.U:

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

       d_open3
            From d_open3.U:

            This variable conditionally defines the HAS_OPEN3
            manifest constant, which indicates to the C program
            that the 3 argument version of the open(2) function
            is available.

       d_pathconf
            From d_pathconf.U:

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

       d_pause
            From d_pause.U:



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


            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_phostname
            From d_gethname.U:

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

       d_pipe
            From d_pipe.U:

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

       d_poll
            From d_poll.U:

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

       d_portable
            From d_portable.U:

            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_pthread_yield
            From d_pthread_y.U:

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

       d_pthreads_created_joinable
            From d_pthreadj.U:

            This variable conditionally defines the
            PTHREADS_CREATED_JOINABLE symbol if pthreads are
            created in the joinable (aka undetached) state.

       d_pwage
            From i_pwd.U:




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


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

       d_pwchange
            From i_pwd.U:

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

       d_pwclass
            From i_pwd.U:

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

       d_pwcomment
            From i_pwd.U:

            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_readdir
            From d_readdir.U:

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

       d_readlink
            From d_readlink.U:




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


            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_MEMCPY symbol if the memcpy() routine can do
            overlapping copies.

       d_sanemcmp
            From d_sanemcmp.U:

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

       d_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.




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


       d_seekdir
            From d_readdir.U:

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

       d_select
            From d_select.U:

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

       d_sem
            From d_sem.U:

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

       d_semctl
            From d_semctl.U:

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

       d_semctl_semid_ds
            From d_union_senum.U:

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

       d_semctl_semun
            From d_union_senum.U:

            This variable conditionally defines USE_SEMCTL_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



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


            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
            setgrent() routine is available for initializing
            sequential access to the group database.

       d_setgrps
            From d_setgrps.U:

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

       d_sethent
            From d_sethent.U:

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

       d_setlinebuf
            From d_setlnbuf.U:

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

       d_setlocale
            From d_setlocale.U:

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



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


            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
            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
            priority.

       d_setpwent
            From d_setpwent.U:

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

       d_setregid
            From d_setregid.U:




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


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

       d_setresgid
            From d_setregid.U:

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

       d_setresuid
            From d_setreuid.U:

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

       d_setreuid
            From d_setreuid.U:

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

       d_setrgid
            From d_setrgid.U:

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

       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.





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


       d_setvbuf
            From d_setvbuf.U:

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

       d_sfio
            From d_sfio.U:

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

       d_shm
            From d_shm.U:

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

       d_shmat
            From d_shmat.U:

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

       d_shmatprototype
            From d_shmat.U:

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

       d_shmctl
            From d_shmctl.U:

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

       d_shmdt
            From d_shmdt.U:

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

       d_shmget
            From d_shmget.U:

            This variable conditionally defines the HAS_SHMGET



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

       d_sigaction
            From d_sigaction.U:

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

       d_sigsetjmp
            From d_sigsetjmp.U:

            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_sockpair
            From d_socket.U:

            This variable conditionally defines the
            HAS_SOCKETPAIR symbol, which indicates that the BSD
            socketpair() is supported.

       d_statblks
            From d_statblks.U:

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

       d_statfsflags
            From d_statfs.U:

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

       d_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.




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


       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_stdiobase
            From d_stdstdio.U:

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

       d_stdstdio
            From d_stdstdio.U:

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

       d_strchr
            From d_strchr.U:

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

       d_strcoll
            From d_strcoll.U:

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

       d_strctcpy
            From d_strctcpy.U:

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

       d_strerrm
            From d_strerror.U:

            This variable holds what Strerrr is defined as to
            translate an error code condition into an error
            message string. It could be strerror or a more



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


            complex 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
            strtod() routine is available to provide better
            numeric string conversion than atof().

       d_strtol
            From d_strtol.U:

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

       d_strtoul
            From d_strtoul.U:

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

       d_strxfrm
            From d_strxfrm.U:

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

       d_suidsafe
            From d_dosuid.U:

            This variable conditionally defines
            SETUID_SCRIPTS_ARE_SECURE_NOW if setuid scripts can
            be secure.  This test looks in /dev/fd/.

       d_symlink
            From d_symlink.U:

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



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


            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_ERRNOLIST
            if sys_errnolist[] is available to translate error
            numbers to the symbolic name.

       d_syserrlst
            From d_strerror.U:

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

       d_system
            From d_system.U:

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

       d_tcgetpgrp
            From d_tcgtpgrp.U:

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

       d_tcsetpgrp
            From d_tcstpgrp.U:

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

       d_telldir
            From d_readdir.U:



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


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

       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
            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_senum.U:

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





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


       d_vfork
            From d_vfork.U:

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

       d_void_closedir
            From d_closedir.U:

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

       d_voidsig
            From d_voidsig.U:

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

       d_voidtty
            From i_sysioctl.U:

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

       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
            symbol, which indicates the wait4() routine is
            available.

       d_waitpid
            From d_waitpid.U:



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


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

       d_wcstombs
            From d_wcstombs.U:

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

       d_wctomb
            From d_wctomb.U:

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

       d_xenix
            From Guess.U:

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

       date From Loc.U:

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

       db_hashtype
            From i_db.U:

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

       db_prefixtype
            From i_db.U:

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

       direntrytype
            From i_dirent.U:

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



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


            directory entries.

       dlext
            From dlext.U:

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

       dlsrc
            From dlsrc.U:

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

       doublesize
            From doublesize.U:

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

       dynamic_ext
            From Extensions.U:

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

       e


       eagain
            From nblock_io.U:

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

       ebcdic
            From ebcdic.U:

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

       echo From Loc.U:

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



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


       egrep
            From Loc.U:

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

       emacs
            From Loc.U:

            This variable is defined but not used by Configure.
            The value is 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
            program.  After Configure runs, the value is reset to
            a plain expr and is not useful.

       extensions
            From Extensions.U:

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

       f


       find From Loc.U:

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

       firstmakefile
            From Unix.U:



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


            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.

       fpostype
            From fpostype.U:

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

       freetype
            From mallocsrc.U:

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

       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
            executable will have the same full pathname to csh.

       full_sed
            From Loc_sed.U:

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

       g


       gccversion
            From cc.U:



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


            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.

       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.

       grep From Loc.U:

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

       groupcat
            From nis.U:

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

       groupstype
            From groupstype.U:

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

       gzip From Loc.U:

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

       h


       h_fcntl
            From h_fcntl.U:

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





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


       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.

       huge From models.U:

            This variable contains a flag which will tell the C
            compiler and loader to produce a program running with
            a huge memory model.  If the huge model is not
            supported, contains the flag to produce large model
            programs.  It is up to the Makefile to use this.

       i


       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
            program 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
            Berkeley's DB include file <db.h>.

       i_dbm
            From i_dbm.U:




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


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

       i_dirent
            From i_dirent.U:

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

       i_dld
            From i_dld.U:

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

       i_dlfcn
            From i_dlfcn.U:

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

       i_fcntl
            From i_fcntl.U:

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

       i_float
            From i_float.U:

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

       i_gdbm
            From i_gdbm.U:

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

       i_grp
            From i_grp.U:

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





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


       i_limits
            From i_limits.U:

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

       i_locale
            From i_locale.U:

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

       i_machcthr
            From i_machcthr.U:

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

       i_malloc
            From i_malloc.U:

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

       i_math
            From i_math.U:

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

       i_memory
            From i_memory.U:

            This variable conditionally defines the I_MEMORY
            symbol, and indicates whether a C program should
            include <memory.h>.

       i_mntent
            From i_mntent.U:

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

       i_ndbm
            From i_ndbm.U:

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



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


            <ndbm.h> exists and should be included.

       i_netdb
            From i_netdb.U:

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

       i_neterrno
            From i_neterrno.U:

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

       i_niin
            From i_niin.U:

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

       i_pwd
            From i_pwd.U:

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

       i_rpcsvcdbm
            From i_dbm.U:

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

       i_sfio
            From i_sfio.U:

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

       i_sgtty
            From i_termio.U:

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





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


       i_stdarg
            From i_varhdr.U:

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

       i_stddef
            From i_stddef.U:

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

       i_stdlib
            From i_stdlib.U:

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

       i_string
            From i_string.U:

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

       i_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
            preference to <sys/ioctl.h>.

       i_sysin
            From i_niin.U:

            This variable conditionally defines I_SYS_IN, which



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            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_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_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_KERNEL, which indicates to the C program
            that it should include <sys/time.h> with KERNEL
            defined.

       i_systimes
            From i_systimes.U:

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

       i_systypes
            From i_systypes.U:

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

       i_sysun
            From i_sysun.U:

            This variable conditionally defines I_SYS_UN, which



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

       i_syswait
            From i_syswait.U:

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

       i_termio
            From i_termio.U:

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

       i_termios
            From i_termio.U:

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

       i_time
            From i_time.U:

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

       i_unistd
            From i_unistd.U:

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

       i_utime
            From i_utime.U:

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

       i_values
            From i_values.U:

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

       i_varargs
            From i_varhdr.U:



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

       i_varhdr
            From i_varhdr.U:

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

       i_vfork
            From i_vfork.U:

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

       ignore_versioned_solibs
            From libs.U:

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

       incpath
            From usrinc.U:

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

       inews
            From Loc.U:

            This variable is defined but not used by Configure.
            The value is 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
            portability, only this variable should be used in
            makefiles.

       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.




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       installman1dir
            From man1dir.U:

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

       installman3dir
            From man3dir.U:

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

       installprivlib
            From privlib.U:

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

       installscript
            From scriptdir.U:

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

       installsitearch
            From sitearch.U:

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

       installsitelib
            From sitelib.U:

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

       installusrbinperl
            From instubperl.U:



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

       intsize
            From intsize.U:

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

       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


       large
            From models.U:

            This variable contains a flag which will tell the C
            compiler and loader to produce a program running with
            a large memory model.  It is up to the Makefile to
            use this.

       ld   From dlsrc.U:

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

       lddlflags
            From dlsrc.U:

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

       ldflags
            From ccflags.U:




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

       less From Loc.U:

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

       lib_ext
            From Unix.U:

            This is an old synonym for _a.

       libc From libc.U:

            This variable contains the location of the C library.

       libperl
            From libperl.U:

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

       libpth
            From libpth.U:

            This variable holds the general path 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.

       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.

       line From Loc.U:

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



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       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
            program.  After Configure runs, the value is reset to
            a plain ln and is not useful.

       lns  From lns.U:

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

       locincpth
            From ccflags.U:

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

       loclibpth
            From libpth.U:

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

       longdblsize
            From d_longdbl.U:

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

       longlongsize
            From d_longlong.U:




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

       longsize
            From intsize.U:

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

       lp   From Loc.U:

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

       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
            program.  After Configure runs, the value is reset to
            a plain ls and is not useful.

       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



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

       make_set_make
            From make.U:

            Some versions of make set the variable MAKE.  Others
            do not.  This variable contains the string to be
            included in Makefile.SH so that MAKE is set if
            needed, and not if not needed.  Possible values are:
            make_set_make=#          # If your make program
            handles this for you, 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,



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            but is filename expanded at configuration time, for
            convenient use in makefiles.

       man1ext
            From man1dir.U:

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

       man3dir
            From man3dir.U:

            This variable contains the name of the directory in
            which manual source pages are to be put.  It is the
            responsibility of the Makefile.SH to get the value of
            this into the proper command.  You must be prepared
            to do the ~name expansion yourself.

       man3direxp
            From man3dir.U:

            This variable is the same as the man3dir variable,
            but is filename expanded at configuration time, for
            convenient use in makefiles.

       man3ext
            From man3dir.U:

            This variable contains the extension that the manual
            page should have: one of n, l, or 3.  The Makefile
            must supply the ..  See man3dir.

       medium
            From models.U:

            This variable contains a flag which will tell the C
            compiler and loader to produce a program running with
            a medium memory model.  If the medium model is not
            supported, contains the flag to produce large model
            programs.  It is up to the Makefile to use this.

       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



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            program.  After Configure runs, the value is reset to
            a plain mkdir and is not useful.

       models
            From models.U:

            This variable contains the list of memory models
            supported by this system.  Possible component values
            are none, split, unsplit, small, medium, large, and
            huge.  The component values are space separated.

       modetype
            From modetype.U:

            This variable defines modetype to be something like
            mode_t, int, unsigned short, or whatever type is used
            to declare file modes for system calls.

       more From Loc.U:

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

       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
            MYHOSTNAME symbol, which is the name of the host the
            program is going to run on.  The domain is not kept



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            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.
            Otherwise it is null.  Correct usage is

                    $echo $n "prompt for a question: $c".


       netdb_hlen_type
            From netdbtype.U:

            This variable holds the type used for the 2nd
            argument to gethostbyaddr().  Usually, this is int or
            size_t or unsigned.  This is only useful if you have
            gethostbyaddr(), naturally.

       netdb_host_type
            From netdbtype.U:

            This variable holds the type used for the 1st
            argument to gethostbyaddr().  Usually, this is char *
            or void *,  possibly with or without a const prefix.
            This is only useful if you have gethostbyaddr(),
            naturally.

       netdb_name_type
            From netdbtype.U:

            This variable holds the type used for the argument to
            gethostbyname().  Usually, this is char * or const
            char *.  This is only useful if you have
            gethostbyname(), naturally.

       netdb_net_type
            From netdbtype.U:

            This variable holds the type used for the 1st
            argument to getnetbyaddr().  Usually, this is int or



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            long.  This is only useful if you have
            getnetbyaddr(), naturally.

       nm   From Loc.U:

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

       nm_opt
            From usenm.U:

            This variable holds the options that may be necessary
            for nm.

       nm_so_opt
            From usenm.U:

            This variable holds the options that may be necessary
            for nm to work on a shared library but that can not
            be used on an archive library.  Currently, this is
            only used by Linux, where nm --dynamic is *required*
            to get symbols from an ELF library which has been
            stripped, but nm --dynamic is *fatal* on an archive
            library.  Maybe Linux should just always set
            usenm=false.

       nonxs_ext
            From Extensions.U:

            This variable holds a list of all non-xs extensions
            included in the package.  All of them will be built.

       nroff
            From Loc.U:

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

       o


       o_nonblock
            From nblock_io.U:

            This variable bears the symbol value to be used
            during open() or fcntl() to turn on non-blocking I/O
            for a file descriptor. If you wish to switch between
            blocking and non-blocking, you may try
            ioctl(FIOSNBIO) instead, but that is only supported
            by some devices.



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       obj_ext
            From Unix.U:

            This is an old synonym for _o.

       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
            (e.g.  4.1.3, 5.2, etc.).  It is primarily used for
            helping select an appropriate hints file, but might
            be useful elsewhere for setting defaults.  It is set
            to '' if we can't figure it out.  We try to be
            flexible about how much of the version number to
            keep, e.g. if 4.1.1, 4.1.2, and 4.1.3 are essentially
            the same for this package, hints files might just be
            os_4.0 or os_4.1, etc., not keeping separate files
            for each little release.

       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.





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       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.

       patchlevel
            From patchlevel.U:

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

       path_sep
            From Unix.U:

            This is an old synonym for p_ in Head.U, the
            character used to separate elements in the command
            shell search PATH.

       perl From Loc.U:

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

       perladmin
            From perladmin.U:

            Electronic mail address of the perl5 administrator.

       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
            program.  After Configure runs, the value is reset to
            a plain pg and is not useful.



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       phostname
            From myhostname.U:

            This variable contains the eventual value of the
            PHOSTNAME symbol, which is a command that can be fed
            to popen() to get the host name.  The program should
            probably not presume that the domain is or isn't
            there already.

       pidtype
            From pidtype.U:

            This variable defines PIDTYPE to be something like
            pid_t, int, ushort, or whatever type is used to
            declare process ids in the kernel.

       plibpth
            From libpth.U:

            Holds the private path used by Configure to find out
            the libraries.  Its value is prepend to libpth. This
            variable takes care of special machines, like the
            mips.  Usually, it should be empty.

       pmake
            From Loc.U:

            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
            package.  Derived from prefix.





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       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.

       prototype
            From prototype.U:

            This variable holds the eventual value of
            CAN_PROTOTYPE, which indicates the C compiler can
            handle funciton prototypes.

       ptrsize
            From ptrsize.U:

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

       r


       randbits
            From randbits.U:

            This variable contains the eventual value of the
            RANDBITS symbol, which indicates to the C program how
            many bits of random number the rand() function
            produces.

       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



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            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!

       rm   From Loc.U:

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

       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


       scriptdir
            From scriptdir.U:

            This variable holds the name of the directory in
            which the user wants to put publicly scripts for the
            package in question.  It is either the same directory
            as for binaries, or a special one that can be mounted
            across different architectures, like /usr/share.
            Programs must be prepared to deal with ~name
            expansion.

       scriptdirexp
            From scriptdir.U:

            This variable is the same as scriptdir, but is
            filename expanded at configuration time, for programs
            not wanting to bother with it.

       sed  From Loc.U:

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




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       selectminbits
            From selectminbits.U:

            This variable holds the minimum number of bits
            operated by select.  That is, if you do select(n,
            ...), how many bits at least will be cleared in the
            masks if some activity is detected.  Usually this is
            either n or 32*ceil(n/32), especially many little-
            endians do the latter.  This is only useful if you
            have select(), naturally.

       selecttype
            From selecttype.U:

            This variable holds the type used for the 2nd, 3rd,
            and 4th arguments to select.  Usually, this is fd_set
            *, if HAS_FD_SET is defined, and int * otherwise.
            This is only useful if you have select(), naturally.

       sendmail
            From Loc.U:

            This variable is used internally by Configure to
            determine the full pathname (if any) of the sendmail
            program.  After Configure runs, the value is reset to
            a plain sendmail 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/whatever -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



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            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 $(C<CC>) -o perl F<perlmain.o> $libperl $libs

                    Typical values are

                    shrpenv="env C<LD_RUN_PATH>=$F<archlibexp/C<CORE>>"

                    or

                    shrpenv=''

                    See the main perl F<Makefile.SH> for actual working usage.
            Alternatively, we might be able to use a command line option such
            as -R $F<archlibexp/C<CORE>> (Solaris, NetBSD) or -Wl,-rpath
            $F<archlibexp/C<CORE>> (Linux).


       shsharp
            From spitshell.U:

            This variable tells further Configure units whether
            your sh can handle # comments.

       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



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            double quotes and separated by commas, suitable for
            use in the SIG_NAME definition below.  A ZERO is
            prepended to the list, and the list is terminated
            with a plain 0.  The leading SIG in signal names is
            removed. See sig_num.

       sig_num
            From sig_name.U:

            This variable holds the signal numbers, comma
            separated. A 0 is prepended to the list
            (corresponding 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.

       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).

       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.

       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



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            front. It is up to the makefile to eventually create
            this directory while performing installation (with ~
            substitution).

       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.

       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.

       small
            From models.U:

            This variable contains a flag which will tell the C
            compiler and loader to produce a program running with
            a small memory model.  It is up to the Makefile to
            use this.

       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



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


            for socket support.

       sort From Loc.U:

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

       spackage
            From package.U:

            This variable contains the name of the package being
            constructed, with the first letter uppercased, i.e.
            suitable for starting sentences.

       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.

       split
            From models.U:

            This variable contains a flag which will tell the C
            compiler and loader to produce a program that will
            run in separate I and D space, for those machines
            that support separation of instruction and data
            space.  It is up to the Makefile to use this.

       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
            VPATH accordingly to find the sources remotely.

       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



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            idiom:

                    eval 'exec perl -S $0 ${1+C<$@>}'

                    if $running_under_some_shell;

                    to guarantee perl startup should the shell execute the script. Note
            that this magic incatation is not understood by csh.


       startsh
            From startsh.U:

            This variable contains the string to put on the front
            of a shell script to make sure (hopefully) that it
            runs with sh and not some other shell.

       static_ext
            From Extensions.U:

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

       stdchar
            From stdchar.U:

            This variable conditionally defines STDCHAR to be the
            type of char used in stdio.h.  It has the values
            "unsigned char" or char.

       stdio_base
            From d_stdstdio.U:

            This variable defines how, given a FILE pointer, fp,
            to access the _base field (or equivalent) of
            stdio.h's FILE structure.  This will be used to
            define the macro FILE_base(fp).

       stdio_bufsiz
            From d_stdstdio.U:

            This variable defines how, given a FILE pointer, fp,
            to determine the number of bytes store in the I/O
            buffer pointer to by the _base field (or equivalent)
            of stdio.h's FILE structure.  This will be used to
            define the macro FILE_bufsiz(fp).

       stdio_cnt
            From d_stdstdio.U:

            This variable defines how, given a FILE pointer, fp,
            to access the _cnt field (or equivalent) of stdio.h's
            FILE structure.  This will be used to define the



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            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).

       strings
            From i_string.U:

            This variable holds the full path of the string
            header that will be used. Typically
            /usr/include/string.h or /usr/include/strings.h.

       submit
            From Loc.U:

            This variable is defined but not used by Configure.
            The value is 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.  This is
            unique to perl.

       sysman
            From sysman.U:

            This variable holds the place where the manual is
            located on this system. It is not the place where the
            user wants to put his manual pages. Rather it is the
            place where Configure may look to find manual for
            unix commands (section 1 of the manual usually). See
            mansrc.

       t


       tail From Loc.U:

            This variable is defined but not used by Configure.



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

       test From Loc.U:

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

       timeincl
            From i_time.U:

            This variable holds the full path of the included
            time header(s).

       timetype
            From d_time.U:

            This variable holds the type returned by time(). It
            can be long, or time_t on BSD sites (in which case
            <sys/types.h> should be included). Anyway, the type
            Time_t should be used.

       touch
            From Loc.U:

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

       tr   From Loc.U:

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



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       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


       uidtype
            From uidtype.U:

            This variable defines Uid_t to be something like
            uid_t, int, ushort, or whatever type is used to
            declare user ids in the kernel.

       uname
            From Loc.U:

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

       uniq From Loc.U:

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

       usedl
            From dlsrc.U:

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

       usemymalloc
            From mallocsrc.U:

            This variable contains y if the malloc that comes
            with this package is desired over the system's
            version of malloc.  People often include special
            versions of malloc for effiency, but such versions
            are often less portable.  See also mallocsrc and
            mallocobj.  If this is y, then -lmalloc is removed



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            from $libs.

       usenm
            From usenm.U:

            This variable contains true or false depending
            whether the nm extraction is wanted or not.

       useopcode
            From Extensions.U:

            This variable holds either true or false to indicate
            whether the Opcode extension should be used.  The
            sole use for this currently is to allow an easy
            mechanism for users to skip the Opcode extension from
            the Configure command line.

       useperlio
            From useperlio.U:

            This variable conditionally defines the USE_PERLIO
            symbol, and indicates that the PerlIO abstraction
            should be used throughout.

       useposix
            From Extensions.U:

            This variable holds either true or false to indicate
            whether the POSIX extension should be used.  The sole
            use for this currently is to allow an easy mechanism
            for hints files to indicate that POSIX will not
            compile on a particular system.

       usesfio
            From d_sfio.U:

            This variable is set to true when the user agrees to
            use sfio.  It is set to false when sfio is not
            available or when the user explicitely requests not
            to use sfio.  It is here primarily so that command-
            line settings can override the auto-detection of
            d_sfio without running into a "WHOA THERE".

       useshrplib
            From libperl.U:

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

       usethreads
            From usethreads.U:

            This variable conditionally defines the USE_THREADS
            symbol, and indicates that Perl should be built to



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            use threads.

       usevfork
            From d_vfork.U:

            This variable is set to true when the user accepts to
            use vfork.  It is set to false when no vfork is
            available or when the user explicitely requests not
            to use vfork.

       usrinc
            From usrinc.U:

            This variable holds the path of the include files,
            which is usually /usr/include. It is mainly used by
            other Configure units.

       uuname
            From Loc.U:

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

       v


       version
            From patchlevel.U:

            The full version number of this package.  This
            combines baserev, patchlevel, and subversion to get
            the full version number, including any possible
            subversions.  Care is taken to use the C locale in
            order to get something like 5.004 instead of 5,004.
            This is unique to perl.

       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.

       z


       zcat 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.

       zip  From Loc.U:

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

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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