--- Libc/Libc-763.13/include/locale.h
+++ Libc/Libc-1698.100.8/include/locale.h
@@ -37,7 +37,10 @@
 #ifndef _LOCALE_H_
 #define _LOCALE_H_
 
+#include <_bounds.h>
 #include <_locale.h>
+
+_LIBC_SINGLE_BY_DEFAULT()
 
 #define	LC_ALL		0
 #define	LC_COLLATE	1
@@ -50,7 +53,7 @@
 #define	_LC_LAST	7		/* marks end */
 
 __BEGIN_DECLS
-char		*setlocale(int, const char *);
+char *_LIBC_CSTR	setlocale(int, const char *);
 __END_DECLS
 
 #endif /* _LOCALE_H_ */