Special thanks to “lldong” for tracking down how to use MacRuby with Xcode 4.3 delivered through the App Store.
For those not in the know, MacRuby has a special hook that lets the interface
builder nib editor know about outlets in MacRuby class files. With Xcode now
being delivered through the app store and installed in
/Applications/Xcode.app instead of /Developer, the MacRuby hook broke.
These instructions help you set it back up, but be warned. It’s not a long term
fix. It involves altering the Xcode.app package which invalidates the code
signing. Everything works okay for the moment, it doesn’t look like Xcode
checks itself. But this is obviously a temporary bandaid unless a new hook
mechanism is built by the MacRuby core team.
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