anchor.diff:  , networkmanager
   , networkmanager-applet
   , nss
  -, p11_kit
  +, p11-kit
   , pango
   , polkit
   , pulseaudio_lib
  
positive.code:     networkmanager
      networkmanager-applet
      #nss
      #p11_kit
      pango
      polkit
      pulseaudio_lib
  
negative.code: stdenv.mkDerivation rec {
    name = "gnome-shell-${version}";
    versionMajor = "3.22";
    versionMinor = "3";
    version = "${versionMajor}.${versionMinor}";
  
    src = fetchurl {
      url = "mirror://gnome/sources/gnome-shell/${versionMajor}/${name}.tar.xz";
      sha256Url = "mirror://gnome/sources/gnome-shell/${versionMajor}/"
        + "${name}.sha256sum";
      sha256 = "d1e6bd80ddd1fef92d80b518d4dbeffa296e8f003402551b8c37c42744b7d42f";
    };
  
    nativeBuildInputs = [
  