For this to work under GHC 7.4.1 I had to have this config:

        nixpkgs.config.packageOverrides = pkgs :
            {
                haskellPackages = pkgs.haskellPackages_ghc741;
                darcs = pkgs.haskellPackages_ghc6123.darcs;
            };

        environment.systemPackages =
               [ pkgs.haskellPackages.cabalInstall_darcs ];

-Corey O'Connor
[email protected]
http://corebotllc.com/
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