--- Libc/Libc-1725.40.4/include/sys/rbtree.h
+++ Libc/Libc-1669.40.2/include/sys/rbtree.h
@@ -34,15 +34,12 @@
 #ifndef _SYS_RBTREE_H_
 #define	_SYS_RBTREE_H_
 
-#include <_bounds.h>
 #include <Availability.h>
 
 #include <sys/types.h>
 #include <stdbool.h>
 #include <inttypes.h>
 #include <sys/queue.h>
-
-_LIBC_SINGLE_BY_DEFAULT()
 
 __BEGIN_DECLS