--- Libc/Libc-583/include/ar.h
+++ Libc/Libc-1698.100.8/include/ar.h
@@ -44,6 +44,10 @@
 #ifndef _AR_H_
 #define	_AR_H_
 
+#include <_bounds.h>
+
+_LIBC_SINGLE_BY_DEFAULT()
+
 /* Pre-4BSD archives had these magic numbers in them. */
 #define	OARMAG1	0177555
 #define	OARMAG2	0177545