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8.23 limits.h

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

Gnulib module: limits-h or gethostname

Portability problems fixed by Gnulib module limits-h:

Portability problems fixed by Gnulib module gethostname:

Portability problems not fixed by Gnulib:

For PATH_MAX, Gnulib provides a module pathmax with a header file "pathmax.h". It defines PATH_MAX to a constant on platforms with a file name length limit.