diff --git a/Makefile b/Makefile
index cdc8f4d..158c863 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,11 @@ options:
 	@echo CC $<
 	@${CC} -c ${CFLAGS} $<
 
-${OBJ}: config.def.h config.mk
+${OBJ}: config.def.h config.h config.mk
+
+config.h:
+	@echo creating $@ from config.def.h
+	@cp config.def.h $@
 
 config.def.h:
 	@echo creating config.h from $@