@node optopt
@section @code{optopt}
@findex optopt

POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/optopt.html}

Gnulib module: ---

Portability problems fixed by Gnulib:
@itemize
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
This variable is missing on some platforms:
MacOS X 10.3, IRIX 6.5, OSF/1 5.1.
@end itemize
