Updated makefile

Makefile

@@ -1,7 +1,15 @@
 CC=gcc
-CFLAGS=-Wall -g
+CFLAGS=-Wall -Werror -g -std=c99
+DEPS = stream.h
+OBJ = main.o stream.o
 
-main: main.o stream.o
+%.o: %.c $(DEPS)
+	$(CC) -c -o $@ $< $(CFLAGS)
+
+main: $(OBJ)
+	$(CC) -o $@ $^ $(CFLAGS)
+
+.PHONY: clean
 
 clean:
-	rm -f main *.o
+	rm -f main $(OBJ)

main.c

@@ -15,6 +15,7 @@ struct interpreter {
 
 int init_interpreter(struct interpreter* I) {
         memset(I, 0, sizeof(struct interpreter));
+        return 0;
 }
 
 int main(int argc, char* argv[]) {