--- Wnn/etc/sstrings.c.orig
+++ Wnn/etc/sstrings.c
@@ -50,6 +50,7 @@
  */
 #include "commonhd.h"
 #include <stdio.h>
+#include <string.h>
 #include "wnn_os.h"
 #include "wnn_string.h"
 
