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10.235 exp2

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/exp2.html

Gnulib module: exp2

Portability problems fixed by Gnulib:

• This function is missing on some platforms: FreeBSD 5.2.1, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, Solaris 9, MSVC 9.
• This function returns grossly wrong results on some platforms: OpenBSD 4.9.

Portability problems not fixed by Gnulib: