1 files changed, 4 insertions, 3 deletions
diff --git a/Makefile b/Makefile
index 5fda526..33e958f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,8 @@
-expr: expr.c
-	$(CC) -g -o $@ expr.c -ll
+expr: expr.c y.tab.c y.tab.h
+	$(CC) -g -o $@ expr.c y.tab.c -ll -ly
 
 expr.c: expr.l
 	lex  -t expr.l > expr.c
 
-
+y.tab.c y.tab.h: expr.y
+	yacc -d expr.y