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10.1055 signbit

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

Gnulib module: signbit

Portability problems fixed by Gnulib:

• This function is missing on some platforms: macOS 14, OpenBSD 6.7, AIX 5.1, Solaris 11.0, MSVC 9, Android 9.0.

Portability problems not fixed by Gnulib: