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10.886 putenv

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/putenv.html, amended through https://www.austingroupbugs.net/view.php?id=1598.

Documentation:
https://www.gnu.org/software/libc/manual/html_node/Environment-Access.html.

Note: POSIX putenv supports adding or changing the value of an environment variable, while glibc also supports removing an environment variable (as if by unsetenv).

Gnulib module: putenv-gnu

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib: