Re: testing current 6-4-branch

The GHC 6.4 branch does not have hs-source-dirs. You need to checkout the HEAD to get it (but bear in mind that the HEAD is likely to be more unstable than the 6.4 branch).

Or instead of using unstable ghc branch you can try using unstable cabal (1.0.1): darcs get http://cvs.haskell.org/darcs/cabal make install ghc-pkg unregister Cabal-1.0 Hope this helps, Pavel.