/* Return pointer to C in S.  */
 #ifndef _HAVE_STRING_ARCH_strchr
 extern void *__rawmemchr (const void *__s, int __c);
-# if __GNUC_PREREQ (3, 2)
 #  define strchr(s, c) \
   (__extension__ (__builtin_constant_p (c) && !__builtin_constant_p (s)	      \
 		  && (c) == '\0'					      \
 		  ? (char *) __rawmemchr (s, c)				      \
 		  : __builtin_strchr (s, c)))
-# else
-#  define strchr(s, c) \