anchor.diff:  , telepathy_logger, libnotify, clutter, libsoup, gnutls
   , evolution_data_server, yelp_xsl
   , libcanberra_gtk3, p11_kit, farstream, libtool, shared_mime_info
  -, bash, wrapGAppsHook, itstool, libxml2, libxslt, icu, libgee }:
  -
  -# TODO: enable more features
  +, bash, wrapGAppsHook, itstool, libxml2, libxslt, icu, libgee
  +, isocodes, enchant, libchamplain, geoclue2, geocode_glib, cheese, libgudev }:
   
   stdenv.mkDerivation rec {
     inherit (import ./src.nix fetchurl) name src;
  
positive.code:     libcanberra_gtk3 telepathy_farstream farstream
      gnome3.defaultIconTheme gnome3.gsettings_desktop_schemas
      librsvg
    ];
  
    meta = with stdenv.lib; {
  
negative.code:     libxml2 libxslt yelp_xsl
    ];
    buildInputs = [
      gtk3 glib webkitgtk icu gnome_online_accounts
      telepathy_glib clutter_gtk clutter-gst cogl
      gst_all_1.gstreamer gst_all_1.gst-plugins-base
      gcr libsecret libpulseaudio gdk_pixbuf
  