-extern struct option *_getopt_long_options;
-
-/* Name of long-named option actually found.
- Only changed when a long-named option is found. */
-
-extern char *_getopt_option_name;
-
-/* The index in GETOPT_LONG_OPTIONS of the long-named option found.
- Only valid when a long-named option has been found by the most
- recent call to `getopt'. */
-
-extern int option_index;
-
+/* Names for the values of the `has_arg' field of `struct option'. */
+
+#define no_argument 0
+#define required_argument 1
+#define optional_argument 2
+
+#if defined (__STDC__) && __STDC__
+/* HAVE_DECL_* is a three-state macro: undefined, 0 or 1. If it is
+ undefined, we haven't run the autoconf check so provide the
+ declaration without arguments. If it is 0, we checked and failed
+ to find the declaration so provide a fully prototyped one. If it
+ is 1, we found it so don't provide any declaration at all. */
+#if !HAVE_DECL_GETOPT
+#if defined (__GNU_LIBRARY__) || defined (HAVE_DECL_GETOPT)
+/* Many other libraries have conflicting prototypes for getopt, with
+ differences in the consts, in unistd.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
+#ifndef __cplusplus
+extern int getopt ();
+#endif /* __cplusplus */
+#endif
+#endif /* !HAVE_DECL_GETOPT */
+
+extern int getopt_long (int argc, char *const *argv, const char *shortopts,
+ const struct option *longopts, int *longind);
+extern int getopt_long_only (int argc, char *const *argv,
+ const char *shortopts,
+ const struct option *longopts, int *longind);
+
+/* Internal only. Users should not call this directly. */
+extern int _getopt_internal (int argc, char *const *argv,
+ const char *shortopts,
+ const struct option *longopts, int *longind,
+ int long_only);
+#else /* not __STDC__ */
+extern int getopt ();
+extern int getopt_long ();
+extern int getopt_long_only ();
+
+extern int _getopt_internal ();
+#endif /* __STDC__ */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* getopt.h */