argp_program_version_hook
-------------------------

Documentation:

Argp Global Variables (libc).

Gnulib module: argp

Portability problems fixed by Gnulib:

  * This variable is missing on all non-glibc platforms: macOS 14, FreeBSD 14.0, NetBSD 10.0, OpenBSD 7.5, Minix 3.1.8, AIX 5.1, HP-UX 11, Solaris 11.4, Cygwin 2.9, mingw, MSVC 14, Android 9.0.

Portability problems not fixed by Gnulib: