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putenv
POSIX specification:
https://pubs.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.