Xcode 4.3 MacRuby compatible problem workaround - 東 . Blog. Annoying, but necessary - the AppStore migration of XCode has broken the template installation of MacRuby, so that even with the new MacRuby (0.11 with support for XCode 4.2 and 4.3 is out) the templates do not work right away and the integration with Interfacebuilder does not work. With the instructions here it works again.