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10.17 acosf

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

Gnulib module: acosf

Portability problems fixed by Gnulib:

• This function is missing on some platforms: Minix 3.1.8, AIX 5.1, Solaris 9.
• This function is only defined as a macro with arguments on some platforms: MSVC 14.

Portability problems not fixed by Gnulib: