setenv
======

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

Gnulib module: setenv

Portability problems fixed by Gnulib:

  * This function is missing on some platforms: AIX 4.3.2, HP-UX 11, IRIX 6.5, Solaris 9, mingw, BeOS.

Portability problems not fixed by Gnulib:

  * In some versions of glibc (e.g. 2.3.3), setenv doesn't fail if the first argument contains a = character.