--- Wnn/etc/server_env.c.orig
+++ Wnn/etc/server_env.c
@@ -33,6 +33,7 @@
  */
 
 #include <stdio.h>
+#include <string.h>
 #include "commonhd.h"
 #include "config.h"
 #include "wnn_os.h"
