--- Libc/Libc-1669.40.2/include/bitstring.h
+++ Libc/Libc-1698.100.8/include/bitstring.h
@@ -39,7 +39,10 @@
 #ifndef _BITSTRING_H_
 #define	_BITSTRING_H_
 
+#include <_bounds.h>
 #include <stdlib.h>
+
+_LIBC_SINGLE_BY_DEFAULT()
 
 typedef	unsigned char bitstr_t;