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10.69.60 optopt ¶

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9799919799/functions/optopt.html

Gnulib module: —

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

• This variable is missing on some platforms: Mac OS X 10.5, MSVC 14.