--- a/Makefile	Wed Jan 21 05:01:01 2015 +0100
+++ b/Makefile	Wed Jan 21 05:04:46 2015 +0100
@@ -139,7 +139,7 @@
 	@which bdist_mpkg >/dev/null || \
 	   (echo "Missing bdist_mpkg (easy_install bdist_mpkg)"; false)
 	rm -rf dist/mercurial-*.mpkg
-	bdist_mpkg setup.py
+	bdist_mpkg setup.py --
 	mkdir -p packages/osx
 	N=`cd dist && echo mercurial-*.mpkg | sed 's,\.mpkg$$,,'` && hdiutil create -srcfolder dist/$$N.mpkg/ -scrub -volname "$$N" -ov packages/osx/$$N.dmg
 	rm -rf dist/mercurial-*.mpkg