fwiw, instead of waiting for this I created a new set of formulas (based on the stock homebrew one). The main difference is that I created one formula for each version since I want to be able to switch between them using brew link/unlink. 

https://github.com/rodlogic/homebrew-ghc



On Wed, Aug 27, 2014 at 5:39 PM, Nicola Gigante <nicola.gigante@gmail.com> wrote:
Hello!

I just want to point to your attention this issue of Homebrew:

https://github.com/Homebrew/homebrew/issues/31609

It seems that they’re forced to remove the formula for the
Haskell Platform because, it seems, the build process has
become extremely complicated and they can’t figure out how
to automate it.

Is there someone that know enough internals of the platform
to help them or to give some advice?

Thanks,
Nicola
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