--- Libc/Libc-1353.11.2/include/bitstring.h
+++ Libc/Libc-1669.0.4/include/bitstring.h
@@ -38,6 +38,8 @@
 
 #ifndef _BITSTRING_H_
 #define	_BITSTRING_H_
+
+#include <stdlib.h>
 
 typedef	unsigned char bitstr_t;