anchor.diff:  , gdk-pixbuf
   , gsettings-desktop-schemas
   , adwaita-icon-theme
  -, docbook_xsl
  +, docbook-xsl-nons
   , docbook_xml_dtd_42
   , desktop-file-utils
   , python3
  
positive.code:   };
  
    meta = with lib; {
      broken = true; # Tracker 3 not supported and it cannot start Tracker 2.
      homepage = "https://wiki.gnome.org/Apps/Books";
      description = "An e-book manager application for GNOME";
      maintainers = teams.gnome.members;
  
negative.code:     gettext
      libxslt
      desktop-file-utils
      docbook-xsl-nons
      docbook_xml_dtd_42
      wrapGAppsHook
      python3
  