unsetenv
========

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

Gnulib module: setenv

Portability problems fixed by Gnulib:

  * This function is missing on some platforms: AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 9, mingw, BeOS.

  * This function has the return type void instead of int on some platforms: MacOS X 10.3, FreeBSD 6.0, NetBSD 1.6, OpenBSD 3.8, OSF/1 5.1.

Portability problems not fixed by Gnulib: