Index: src/Makefile.am
===================================================================
--- src/Makefile.am	(revision 160)
+++ src/Makefile.am	(working copy)
@@ -266,5 +266,5 @@
 # Special target to make a disk image of the bundled app
 .PHONY: bundle-dmg
 bundle-dmg:
-	hdiutil create  -srcfolder $(bundle_name) -volname Enigma -imagekey zlib-level=6 $(top_builddir)/etc/enigma.dmg
+	hdiutil create  -ov -srcfolder $(bundle_name) -volname Enigma -imagekey zlib-level=6 $(top_builddir)/etc/enigma.dmg