Index: Makefile
===================================================================
--- Makefile	(revision 30381)
+++ Makefile	(revision 30382)
@@ -7,8 +7,10 @@
 TESTS = \
 thickness.diff overlap.diff
 
-all: $(TESTS)
+test: $(TESTS)
 
+all:
+
 thickness.diff: thickness.out
 	@diff -u thickness.out thickness.ref && rm thickness.out