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haskellcabalcabal-install

Cabal configure can't find an installed package inside a cabal sandbox

I've made a cabal sandbox, installed a package to it, yet runhaskell Setup configure complains that the package dependency that I just installed is missing.

I verified the package name and version and that's okay.
Running cabal install --dependencies-only says "all the requested packages are already installed".

What's going on & how can I fix it?

If relevant I've encountered this with QuickCheck-2.7.5 on Windows 7 with cabal-install 1.20.0.3 using cabal 1.20.0.1 and ghc 7.6.3.

Configuring through runhaskell Setup configure outputs:

Configuring MyPackage-0.1.0.0...
Setup.hs: At least the following dependencies are missing: QuickCheck ==2.7.5

Solution

  • Instead of running runhaskell Setup configure, you should do cabal configure. runhaskell doesn't know about sandboxes.