Node:UNIX Variants,
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UNIX Variants
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.
If on AIX, define _ALL_SOURCE. Allows the use of some BSD
functions. Should be called before any macros that run the C compiler.
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For INTERACTIVE UNIX (ISC), add -lcposix to output
variable LIBS if necessary for POSIX facilities. Call this
after AC_PROG_CC and before any other macros that use POSIX
interfaces. INTERACTIVE UNIX is no longer sold, and Sun says that
they will drop support for it on 2006-07-23, so this macro is becoming
obsolescent.
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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.
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