returns the contents of the `val' field. */
struct option {
-#if defined (STDC) && STDC
+#if defined (__STDC__) && __STDC__
const char *name;
#else
char *name;
#define required_argument 1
#define optional_argument 2
-#if defined (STDC) && STDC
-#ifdef GNU_LIBRARY
+#if defined (__STDC__) && __STDC__
+#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 */
+#else /* not __GNU_LIBRARY__ */
extern int getopt();
-#endif /* GNU_LIBRARY */
+#endif /* __GNU_LIBRARY__ */
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,
int long_only);
-#else /* not STDC */
+#else /* not __STDC__ */
extern int getopt();
extern int getopt_long();
extern int getopt_long_only();
extern int _getopt_internal();
-#endif /* STDC */
+#endif /* __STDC__ */
#ifdef cplusplus
}