-TESTS = threads p1 userprog p2 vm p3 filesys p4
+TESTS = threads p1 userprog p2 vm p3 filesys p4
PATH := $(shell pwd)/../src/utils:$(PATH)
cd $@/src/$(PROJECT) && $(MAKE) check
cd $@/src/$(PROJECT) && $(MAKE) grade
cd $@/src/$(PROJECT) && grep -q PERFECT build/grade
-cd $@/src/$(PROJECT) && ! grep -q warning build/grade
+cd $@/src/$(PROJECT) && grep -qv warning build/grade
endef
define compile