Building GHC head with clang on Mavericks

[Kazu Yamamoto (=?iso-2022-jp?B?GyRCOzNLXE9CSScbKEI=?=)]

Hi Carter,

> Nick Partridge hit this recently and he's got PR's pending for Happy and
> Alex https://github.com/simonmar/alex/pull/37 and
> https://github.com/simonmar/happy/pull/12

I'm not using GCC. (In my previous message, I made a typo. "GCC"
should be read as "clang"). So, I think that this is a different
problem.

--Kazu