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by Peaker 5331 days ago
When you "cabal unpack language-python" and fix the dependencies, make sure you boost its minor version number (e.g: from: 1.0.3 to 1.0.3.1), otherwise cabal-install will ignore your custom install of the package and will revert to the one from the repositories.

cabal-install is a big hurdle -- must be improved for faster Haskell adoption.