9.56 stdlib.h

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/stdlib.h.html

Gnulib module: stdlib-h, system-posix

Portability problems fixed by the Gnulib module stdlib-h:

Portability problems fixed by the Gnulib module system-posix:

Portability problems not fixed by Gnulib: