Portability problems fixed by Gnulib:
@itemize
@item
+This function is missing on some platforms:
+AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, MSVC 9, Interix 3.5.
+@item
The function @code{getopt_long} does not obey the combination of
@samp{+} and @samp{:} flags in the options string on some platforms:
glibc 2.11.
arguments on some platforms:
MacOS X 10.5, OpenBSD 4.0, AIX 5.2, IRIX 6.5, Solaris 11 2010-11, Cygwin 1.5.x.
@item
-This function is missing on some platforms:
-AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Interix 3.5.
+This function crashes if the option string includes @code{W;} but
+there are no long options, on some platforms:
+glibc 2.14.
@end itemize
Portability problems not fixed by Gnulib: