Don't use ! in shell--Solaris sh doesn't support it.

diff --git a/tests/Makefile b/tests/Makefile
index 705472f8aa420b5dbd944bde9e795270c8c38db7..3adf8e38ac9f72a9ea6ed4d52a37d2b5180d8153 100644 (file)
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -28,7 +28,7 @@ define run-tests-grade
 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