diff --git a/Makefile b/Makefile
index b742c44..4f178cb 100644
--- a/Makefile
+++ b/Makefile
@@ -5,6 +5,9 @@ MAIN = ccmeta
 
 all : $(MAIN)
 
+tree : all .FORCE
+	./$(MAIN) < $(MAIN)-tree.txt > $(MAIN)-tree.out
+
 test : all .FORCE
 	./$(MAIN) < $(MAIN)-test.txt > $(MAIN)-test.out
 	diff $(MAIN)-test.ref $(MAIN)-test.out
@@ -24,6 +27,9 @@ tidy : .FORCE
 clean : .FORCE
 	rm -f $(MAIN) $(MAIN).c
 
-spotless : clean tidy
+Rtree : .FORCE
+	rm -f *~ $(MAIN)-tree.out
+
+spotless : clean tidy Rtree
 
 .FORCE :