Problems building HEAD on Mac OS X Mavericks/Xcode 5

[Nick Partridge]

Hi,

I've hit a build failure when trying to build HEAD on Mavericks. I've
logged a bug here with a lot of detail:
https://ghc.haskell.org/trac/ghc/ticket/8528.

When using alex 3.1.2, some of the generated files have spaces preceding
preprocessor statements, while alex 3.1.0 doesn't do this. I guess this is
possibly an alex bug, but this is my first time building GHC so I'm not
really sure how the ecosystem works :)

Huge shout-out to Carter S. for giving me a ton of help in nailing down
this issue!

- Nick
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