(autoconf.info)UNIX Variants

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4.10 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  This macro is obsolete; instead, use 'AC_FUNC_GETMNTENT'.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  This macro is obsolete.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     is obsolete; instead, use 'AC_FUNC_STRFTIME'.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  This macro is
     obsolete; use 'AC_HEADER_DIRENT' instead.