diff --git a/src/devtools/met-driver/4.9/common/util.h b/src/devtools/met-driver/4.9/common/util.h
new file mode 100644
index 0000000..5730376
--- /dev/null
+++ b/src/devtools/met-driver/4.9/common/util.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2018 MediaTek Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _SRC_UTIL_H_
+#define _SRC_UTIL_H_
+
+/* #define FILELOG 1 */
+
+#ifdef FILELOG
+void filelog(char *str);
+#else
+#define filelog(str)
+#endif
+
+#endif				/* _SRC_UTIL_H_ */