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9.22 libgen.h

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/libgen.h.html

Gnulib module: —

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

• This header file is missing on some platforms: mingw, MSVC 14.

The Gnulib module dirname provides similar API, with functions base_name and dir_name that also work with Windows file names.