Linking Gitbox diff tool to FileMerge after upgrading to Xcode 5

I just upgraded to Xcode 5 and now Gitbox doesn't seem to be able to find FileMerge as the diff tool, and has no options for setting a path manually. Anyone know a way to link it up again?

Solution

Fail. Fail. Fail. The problem was I just needed to fire up Xcode apparently :) Oops.

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