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POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html
Gnulib module: unistd
Portability problems fixed by Gnulib:
_exit
function is not declared in this file on some platforms:
mingw.
NULL
macro that cannot be used in arbitrary
expressions:
NetBSD 5.0
Portability problems not fixed by Gnulib: