On Fri, 17 Jun 2011, Dmitri O.Kondratiev wrote:
How to make cabal install all the dependencies? I couldn't find this in the docs at: http://www.haskell.org/haskellwiki/Cabal-Install
Usually, 'cabal install' automatically installs all imported packages. But it will certainly not do, if a dependency problem cannot be solved by downloading packages. In your case it may be, that installed packages are compiled with respect to different versions of the same package, say 'transformers'. I found out, that you get more useful cabal messages if you force cabal-install to use a specific version of a package. Say, run $ ghc-pkg list transformers transformers-0.2.2.0 Then call $ cabal install spreadsheet --constraint=transformers==0.2.2.0 What does 'cabal' tell you?