self: super: {
  crossover = self.callPackage ./crossover {};
  oscar = self.callPackage ./oscar/git.nix {};

  xmonad-with-packages = self.callPackage (self.path + "/pkgs/applications/window-managers/xmonad/wrapper.nix") {
    inherit (self.haskellPackages) ghcWithPackages;
    packages = old: [ self.haskellPackages.xmonad-contrib ];
  };
}