diff --git a/Makefile b/Makefile
index 10667d6..1fceb75 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,4 @@
+CFLAGS += -Wall -W
 CPPFLAGS += -I.
 YFLAGS = -d
 
@@ -14,7 +15,7 @@
 	@mkdir -p .depfiles ; mv $*.d .depfiles
 
 lex_cis.o: lex_cis.c yacc_cis.h
-	$(CC) -MD $(CFLAGS) $(CPPFLAGS) -c $<
+	$(CC) -MD $(CFLAGS) -Wno-unused-function $(CPPFLAGS) -c $<
 	@mkdir -p .depfiles ; mv $*.d .depfiles
 
 pack_cis: pack_cis.o lex_cis.o yacc_cis.o