5 POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/isinf.html}
9 Portability problems fixed by Gnulib:
12 This macro is missing on some platforms:
13 AIX 4.3.2, IRIX 6.5, OSF/1 5.1, Solaris 11 2010-11.
16 Portability problems not fixed by Gnulib: