--- Wnn/romkan/rk_bltinfn.c.orig
+++ Wnn/romkan/rk_bltinfn.c
@@ -58,6 +58,7 @@
 #include "commonhd.h"
 #include "config.h"
 #include "rk_header.h"
+#include <string.h>
 
  /* ȾʸΥɤdefine */
 #define HKCHOU	(HNKAK1 * 0x100 + 0xB0) /*  */
