Index: Makefile
===================================================================
--- Makefile	(revision 30380)
+++ Makefile	(revision 30381)
@@ -4,8 +4,11 @@
 TDIR=../tests/drc_query
 PCBRND=./pcb-rnd
 
-all: thickness.diff
+TESTS = \
+thickness.diff overlap.diff
 
+all: $(TESTS)
+
 thickness.diff: thickness.out
 	@diff -u thickness.out thickness.ref && rm thickness.out