Initial commit.
diff --git a/inc/dlog.h b/inc/dlog.h
new file mode 100644
index 0000000..d4c08c0
--- /dev/null
+++ b/inc/dlog.h
@@ -0,0 +1,12 @@
+#ifndef _DLOG_H
+#define _DLOG_H
+
+#if DEBUG
+void dlog(const char *fmt, ...);
+#else
+#define dlog(...)
+#endif
+
+void dlog_init(void (*pchar)(char));
+
+#endif  /* _DLOG_H */