I've now prepared release candidate for Cabal/cabal-install 1.22. Please test them and report bugs here and/or on the bug tracker (https://github.com/haskell/cabal/issues). To install:

    cabal install http://johantibell.com/files/Cabal-1.22.0.0-rc.tar.gz http://johantibell.com/files/cabal-install-1.22.0.0-rc.tar.gz

Cabal is now such a big project that's used in so many context (e.g. different OSes) that we need your help to help us test, to make sure that new releases work for you.

-- Johan