Andi,

> Is there a workaround for http://ghc.haskell.org/trac/ghc/ticket/8276. I
> haven't been able to build HEAD for a while due to this issue.

Put the following one line to your mk/build.mk.

HADDOCK_DOCS       = NO

The entire contents of my build.mk is:

InstallExtraPackages = YES
HADDOCK_DOCS       = NO

--Kazu