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10.1056 signgam

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/signgam.html

Gnulib module: —

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

• This variable is missing on some platforms: macOS 10.13, Minix 3.1.8, AIX 5.1, mingw, MSVC 14.