anchor.diff:  
     nativeBuildInputs = [
       gettext
  -    gobject-introspection
       intltool
       itstool
       libxslt
  -    vala
     ];
   
     buildInputs = [
  
positive.code:     #libcue
      libexif
      #libgrss
      #libgxps
      libgsf
      #libiptcdata
      libjpeg
      #libmediaart
      libnotify
      #libosinfo
      libpng
      librsvg
      libtiff
  
negative.code: stdenv.mkDerivation rec {
    name = "tracker-${version}";
    versionMajor = "1.6";
    versionMinor = "1";
    version = "${versionMajor}.${versionMinor}";
  
    src = fetchurl {
      url = "mirror://gnome/sources/tracker/${versionMajor}/${name}.tar.xz";
      sha256 = "1vf1y2jn17yz70gfm5xsprydga67848izv3bymnq6js59wzxfgk5";
    };
  
    propagatedUserEnvPkgs = [
  