diff --git a/Makefile b/Makefile
index 3b4ff387..2005ab97 100644
--- a/Makefile
+++ b/Makefile
@@ -1,10 +1,14 @@
 all: build run
 
 build:
-	gcc -o bin/picrin -I./include src/main.c src/state.c src/gc.c src/pair.c src/write.c src/symbol.c src/value.c
+	cd src; \
+	yacc -d parse.y; \
+	lex scan.l
+	gcc -o bin/picrin -I./include src/main.c src/state.c src/gc.c src/pair.c src/write.c src/symbol.c src/value.c src/y.tab.c src/lex.yy.c
 
 clean:
-	rm bin/picrin
+	rm -f src/y.tab.c src/y.tab.h src/lex.yy.c
+	rm -f bin/picrin
 
 run:
 	bin/picrin
diff --git a/src/main.c b/src/main.c
index 806c720f..28f04b18 100644
--- a/src/main.c
+++ b/src/main.c
@@ -32,6 +32,7 @@ main()
   pic_state *pic;
   char line[LINE_MAX_LENGTH], last_char;
   int char_index;
+  pic_value v;
 
   pic = pic_open();
 
@@ -51,8 +52,9 @@ main()
     line[char_index] = '\0';
 
     /* echo */
-    printf("%s", line);
+    v = pic_parse(pic, line);
 
+    pic_debug(pic, v);
     printf("\n");
   }