anchor.diff:  { stdenv
   , fetchurl
  -, fetchpatch
  -, pkgconfig
  +, pkg-config
   , dconf
   , telepathy-glib
   , python3
  
positive.code:   meta = with stdenv.lib; {
      description = "An account manager and channel dispatcher for the Telepathy framework";
      homepage = "https://telepathy.freedesktop.org/components/telepathy-mission-control/";
      license = licenses.lgpl21;
      maintainers = with maintainers; [ jtojnar ];
      platforms = platforms.unix;
    };
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "telepathy-mission-control";
    version = "5.16.6";
  
    outputs = [ "out" "lib" "dev" ];
  
    src = fetchurl {
      url = "https://telepathy.freedesktop.org/releases/${pname}/${pname}-${version}.tar.gz";
      sha256 = "0ibs575pfr0wmhfcw6ln6iz7gw2y45l3bah11rksf6g9jlwsxy1d";
    };
  
    buildInputs = [
      python3
    ]; # ToDo: optional stuff missing
  
    nativeBuildInputs = [
      pkg-config
      libxslt
      makeWrapper
    ];
  