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(autoconf.info)UNIX Variants

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UNIX Variants
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   The following macros check for certain operating systems that need
special treatment for some programs, due to exceptional oddities in
their header files or libraries.  These macros are warts; they will be
replaced by a more systematic approach, based on the functions they make
available or the environments they provide.

 - Macro: AC_AIX
     If on AIX, define `_ALL_SOURCE'.  Allows the use of some BSD
     functions.  Should be called before any macros that run the C
     compiler.

 - Macro: AC_DYNIX_SEQ
     If on Dynix/PTX (Sequent UNIX), add `-lseq' to output variable
     `LIBS'.  This macro is obsolete; instead, use `AC_FUNC_GETMNTENT'.

 - Macro: AC_IRIX_SUN
     If on IRIX (Silicon Graphics UNIX), add `-lsun' to output variable
     `LIBS'.  This macro is obsolete.  If you were using it to get
     `getmntent', use `AC_FUNC_GETMNTENT' instead.  If you used it for
     the NIS versions of the password and group functions, use
     `AC_CHECK_LIB(sun, getpwnam)'.

 - Macro: AC_ISC_POSIX
     If on a POSIXized ISC UNIX, define `_POSIX_SOURCE' and add
     `-posix' (for the GNU C compiler) or `-Xp' (for other C compilers)
     to output variable `CC'.  This allows the use of POSIX facilities.
     Must be called after `AC_PROG_CC' and before any other macros
     that run the C compiler.

 - Macro: AC_MINIX
     If on Minix, define `_MINIX' and `_POSIX_SOURCE' and define
     `_POSIX_1_SOURCE' to be 2.  This allows the use of POSIX
     facilities.  Should be called before any macros that run the C
     compiler.

 - Macro: AC_SCO_INTL
     If on SCO UNIX, add `-lintl' to output variable `LIBS'.  This
     macro is obsolete; instead, use `AC_FUNC_STRFTIME'.

 - Macro: AC_XENIX_DIR
     If on Xenix, add `-lx' to output variable `LIBS'.  Also, if
     `dirent.h' is being used, add `-ldir' to `LIBS'.  This macro is
     obsolete; use `AC_HEADER_DIRENT' instead.