Hi everyone, I had looked at Haskell some years ago but dropped it because there wasn't much support for the kind of work I do, which is numerical computation. Now there's exciting new stuff such as repa, so I decided to give it another try. I installed the Haskell platform 2011.2.0.1 for MacOS X 10.6 and started working through the tutorial at http://www.haskell.org/haskellwiki/Numeric_Haskell:_A_Repa_Tutorial Unfortunately I didn't get very far, because I am stuck at installing repa: cabal install repa Resolving dependencies... cabal: cannot configure repa-2.2.0.1. It requires base ==4.4.* For the dependency on base ==4.4.* there are these packages: base-4.4.0.0. However none of them are available. base-4.4.0.0 was excluded because of the top level dependency base -any I don't understand what this means (what's so bad about "any"?) nor do I have the slightest clue what to do about it. There's a brief Stack Overflow discussion about this at http://stackoverflow.com/questions/7375719/cabal-install-dependency-error-ba... but it doesn't provide a solution either. Any help would be greatly appreciated - I just recall that my goal is not understanding cabal, but working with repa. Konrad.