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9.827 putenv

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

Gnulib module: —

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

Extension: Gnulib provides a module ‘putenv’ that substitutes a putenv implementation that can also be used to remove environment variables.