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Haskell's power is impressive but the "Cabal hell" is a serious problem.

Recently I tried to get into Haskell. I've installed EclipseFP and the first sessions looked nice. But when I started to use external cabal modules I always ran into serious trouble with versioning. Even recompilation doesn't help a lot because there is always a complaining module.

Do I something wrong? I am thankful for advice.

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You may want to try cabal sandboxes. I think it's a similar idea to virtualenv in python

Thanks, I will take a closer look at it.

I hope this is a hierarchical solution so that I won't need to download the whole cabal stack for any new project.

It is, you won't have to download the entire stack. You might want to try this tutorial out:

http://yannesposito.com/Scratch/en/blog/Holy-Haskell-Starter...

http://fpcomplete.com free Community edition online dev environment.

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