4 POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/basedefs/fenv.h.html}
8 Portability problems fixed by Gnulib:
12 Portability problems not fixed by Gnulib:
15 This header file is missing on some platforms:
16 FreeBSD 5.2.1, NetBSD 5.0, OpenBSD 3.8, AIX 5.1, IRIX 6.5, OSF/1 5.1,
17 Cygwin 1.7.7, Interix 3.5, BeOS.