#define optional_argument 2
#if defined (__STDC__) && __STDC__
-#ifdef __GNU_LIBRARY__
+#if defined (__GNU_LIBRARY__) || defined (__EXTENSIONS__)
/* Many other libraries have conflicting prototypes for getopt, with
differences in the consts, in stdlib.h. To avoid compilation
errors, only prototype getopt for the GNU C library. */
extern int getopt (int argc, char *const *argv, const char *shortopts);
-#else /* not __GNU_LIBRARY__ */
+#else /* not __GNU_LIBRARY__ or __EXTENSIONS__ */
extern int getopt (void);
#endif /* __GNU_LIBRARY__ */
extern int getopt_long (int argc, char *const *argv, const char *shortopts,