Hi Andreas, thank you for the quick response. > As to the new Haskell Platform: it is not intended to work with > ghc-6.10.4. In that case, maybe "nix-env -u \*" shouldn't try to update from haskell-haskell-platform-ghc6.10.4-2009.2.0.2 to version 2010.1.0.0? Take care, Peter