# makefile3

# Ʒ ڵ带  
#    dependecy  ̾߱ ϰ
# makefile4 .

.c.o: 
	@echo "Compiling" $< "..."
	cc -c $< -I.

app: main.o foo.o goo.o
	@echo "Building target" $@ "..." 
	cc -o app main.o foo.o goo.o

#problem dependency