9.603 nextafter

POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/functions/nextafter.html

Gnulib module: nextafter

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

• This function is missing on some platforms: Minix 3.1.8, MSVC 9.
• This function is not declared on some platforms: IRIX 5.3.