{
  packageOverrides = pkgs: rec {
    redo = pkgs.callPackage ../custom/redo-wrapper.nix {};
    myHaskellPackages = pkgs.recurseIntoAttrs (
      pkgs.haskellPackages.override {
        extension = self: super: let
	  callPackage = pkgs.lib.callPackageWith self;
	in rec {
          inherit (pkgs.haskellngPackages) boolexpr;
        };
      }
    );
  } // (import ../utils/nix/default.nix) {};
}