anchor.diff: -{ lib, stdenv, pkg-config, fetchFromGitHub, python3, vala_0_40
  +{ lib, stdenv, pkg-config, fetchFromGitHub, python3, vala
   , gtk3, libwnck, libxfce4util, xfce4-panel, wafHook, xfce }:
   
   stdenv.mkDerivation rec {
  
positive.code:     license = licenses.mit;
      platforms = platforms.linux;
      maintainers = with maintainers; [ volth ] ++ teams.xfce.members;
    };
  }
  
negative.code:     sha256 = "sha256-aKrJzf9rwCyXAJsRIXdBzmJBASuXD5I5kZrp+atx4FA=";
    };
  
    nativeBuildInputs = [ pkg-config vala wafHook python3 ];
    buildInputs = [ gtk3 libwnck libxfce4util xfce4-panel ];
  
    postPatch = ''
  