new file mode 100644
@@ -0,0 +1,9 @@
+all: \
+ $(patsubst %.dot,%.png,$(wildcard *.dot)) \
+ $(patsubst %.dot,%.xdot,$(wildcard *.dot))
+
+%.png: %.dot
+ dot -Tpng -o$@ $<
+%.xdot: %.dot
+ dot -Txdot -o$@ $<