_POSIX_VERSION
0, _POSIX_VERSION, "Version of POSIX attempting to comply to");
#ifndef _POSIX_VERSION
#ifndef _POSIX_VERSION
#if (_POSIX_VERSION == 198808L)
#elif (_POSIX_VERSION == 199009L)
#elif (_POSIX_VERSION >= 199309L)
_POSIX_VERSION);
#if _POSIX_VERSION < 199309