overlay.nix

# Override haskellPackages within nixpkgs.

self: pkgs:

{
  haskellPackages =
    pkgs.haskell.packages.ghc802.override
      {
        overrides =
          self: super:

          with pkgs.haskell.lib;

          let

            inherit (pkgs) fetchgit fetchurl fetchFromGitHub;

          in

            {
              rel8 = super.callPackage (fetchgit {
                url = git://github.com/ocharles/rel8;
                rev = "49e986451586769af60005641cd09c0a2423ff53";
                sha256 = "1svvzj03g3nz8ql82lq2b8idjyx596ybp2mlg1cn3mmfv26lzsbl";
              }) {};
          };
      };
}