@node getopt.h
@section @file{getopt.h}

Defines the type @code{struct option} and declares the variables
@code{optarg}, @code{optind}, @code{opterr}, @code{optopt}
and the functions @code{getopt}, @code{getopt_long}, @code{getopt_long_only}.

Documentation:
@itemize
@item
@ifinfo
@ref{Getopt,,Parsing program options using `getopt',libc},
@end ifinfo
@ifnotinfo
@url{https://www.gnu.org/software/libc/manual/html_node/Getopt.html},
@end ifnotinfo
@item
@uref{https://www.kernel.org/doc/man-pages/online/pages/man3/getopt.3.html,,man getopt}.
@end itemize

Gnulib module: getopt-gnu

Portability problems fixed by Gnulib:
@itemize
@item
This header file is missing on some platforms:
AIX 5.1, HP-UX 11, MSVC 14, Interix 3.5.
@item
The function @code{getopt_long} is missing on some platforms:
IRIX 6.5, OSF/1 5.1, Solaris 9.
@item
The function @code{getopt_long_only} is missing on some platforms:
Mac OS X 10.3, FreeBSD 5.2.1, NetBSD 5.0, IRIX 6.5, OSF/1 5.1, Solaris 9, mingw.
@item
The method to reset options is incompatible on some platforms:
FreeBSD 6.0, NetBSD 5.0(?), OpenBSD 3.8, Cygwin 1.5.x, mingw.
@item
The function @code{getopt} does not handle a leading @samp{+} character in
the options string on some platforms:
Solaris 11 2010-11.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@end itemize