diff --git a/src/gm-debug.h b/src/gm-debug.h
new file mode 100644
index 0000000..e75ccce
--- /dev/null
+++ b/src/gm-debug.h
@@ -0,0 +1,13 @@
+#ifndef __GM_DEBUG_H__
+#define __GM_DEBUG_H__ 1
+
+typedef enum _GmDebugLevel {
+	DEBUG_ALWAYS = 1 << 1,
+	DEBUG_DEFAULT = 1 << 2,
+	DEBUG_MCP = 1 << 3
+} GmDebugLevel;
+
+void gm_debug_msg(GmDebugLevel level, char *line, ...);
+void gm_debug_set_level(GmDebugLevel level);
+
+#endif /* __GM_DEBUG_H__ */