--- a/Makefile	Sun Mar 01 12:49:52 2009 +0100
+++ b/Makefile	Sun Mar 01 12:50:22 2009 +0100
@@ -17,6 +17,7 @@
 %:	%.pl
 	perl -c $<
 	cp -f $< $@
+	perl -i -pe 's/^<VERSION>/join "", map{s{^}{\t}; $$_}`hg parents`/e' $@
 	chmod a+x-w $@
 
 %.gz:	%