__GNU_LIBRARY__
#if defined (__GNU_LIBRARY__) ? defined (__USE_GNU) : !defined (__STRICT_ANSI__)
#if defined (__GNU_LIBRARY__ ) || defined (__linux__) || defined (__FreeBSD__) || defined (__CYGWIN__) || defined (__CYGWIN32__)
# if defined __GNU_LIBRARY__ || defined HAVE_STDLIB_H
#if !defined _LIBC && defined __GNU_LIBRARY__ && __GNU_LIBRARY__ > 1