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+@node optopt
+@subsection @code{optopt}
+@findex optopt
+
+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, Cygwin.
+@end itemize