Currently at commit 7e91e5bf and this was not failing to build 2 days ago.

Compiling results in:

"inplace/bin/ghc-stage1" -hisuf dyn_hi -osuf  dyn_o -hcsuf dyn_hc -fPIC -dynamic 
  -H32m -O -Werror -Wall -H64m -O0    -hide-all-packages -i -iutils/hpc/. 
  -iutils/hpc/dist-install/build -iutils/hpc/dist-install/build/autogen
  -Iutils/hpc/dist-install/build -Iutils/hpc/dist-install/build/autogen
  -optP-include -optPutils/hpc/dist-install/build/autogen/cabal_macros.h
  -package array-0.4.0.2 -package base-4.7.0.0 -package containers-0.5.2.1
  -package directory-1.2.0.1 -package hpc-0.6.0.1 -XHaskell98 -XCPP
  -no-user-package-db -rtsopts -fwarn-tabs     -odir utils/hpc/dist-install/build
  -hidir utils/hpc/dist-install/build -stubdir utils/hpc/dist-install/build
  -c utils/hpc/dist-install/build/HpcParser.hs
  -o utils/hpc/dist-install/build/HpcParser.dyn_o 
ghc-stage1: panic! (the 'impossible' happened)
  (GHC version 7.7.20130830 for powerpc64-unknown-linux):
        expectJust block_order