--- Libc/Libc-1725.40.4/include/ctype.h
+++ Libc/Libc-1353.11.2/include/ctype.h
@@ -63,8 +63,13 @@
  *	@(#)ctype.h	8.4 (Berkeley) 1/21/94
  */
 
+#ifndef	_CTYPE_H_
+#define _CTYPE_H_
+
 #include <_ctype.h>
 
 #ifdef _USE_EXTENDED_LOCALES_
 #include <xlocale/_ctype.h>
 #endif /* _USE_EXTENDED_LOCALES_ */
+
+#endif /* !_CTYPE_H_ */