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9.30 netdb.h

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

Gnulib module: netdb

Portability problems fixed by Gnulib:

• This header file is missing on some platforms: mingw, MSVC 14.
• This header file is incomplete on some platforms: Cygwin 1.5.x, Haiku.
• This header file does not define AI_ALL, AI_V4MAPPED on some platforms: NetBSD 10.0.
• This header file does not define AI_ADDRCONFIG on some platforms: NetBSD 5.0.
• This header file incorrectly defines NI_MAXHOST on some platforms: musl libc 1.2.4, OpenBSD 7.5.

Portability problems not fixed by Gnulib: