v=`sed -e 's/-dirty$$//' <$@`; echo "$$v-dirty" >$@
# Force Make to start over after updating .tarball-version, so that
# $(version) gets the new value
-$(srcdir)/.dirty-stamp: .tarball-version
+$(srcdir)/.dirty-stamp: $(srcdir)/.tarball-version
>$@
include $(srcdir)/.dirty-stamp
endif