Hi, > I believe this is related to > http://ghc.haskell.org/trac/ghc/ticket/8205 - can you try: > > $ git revert d61c3ac186c94021c851f7a2a6d20631e35fc1ba > > and see if your build finishes? Perhaps you can help Jan diagnose it if so... Yes. After this command, I can build GHC head on Mac. --Kazu