2 @subsection @code{argp_usage}
7 @ref{Argp Helper Functions,,Functions For Use in Argp Parsers,libc}.
10 @url{https://www.gnu.org/software/libc/manual/html_node/Argp-Helper-Functions.html}.
15 Portability problems fixed by Gnulib:
19 Portability problems not fixed by Gnulib:
22 This function is missing on all non-glibc platforms:
23 Mac OS X 10.13, FreeBSD 6.0, NetBSD 9.0, OpenBSD 6.7, Minix 3.1.8, AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 11.4, Cygwin 2.9, mingw, MSVC 14, Android 9.0.