--- a/src/getopt.h
+++ b/src/getopt.h
@@ -139,14 +139,10 @@ struct option
    `getopt'.  */
 
 #if (defined __STDC__ && __STDC__) || defined __cplusplus
-# ifdef __GNU_LIBRARY__
 /* 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__ */
-extern int getopt ();
-# endif /* __GNU_LIBRARY__ */
 
 # ifndef __need_getopt
 extern int getopt_long (int __argc, char *const *__argv, const char *__shortopts,