anchor.diff:      libxml2
       pango
       shared_mime_info
  -    gnome3.tracker
  +    tracker
  +    xorg.libX11
     ];
   
     preFixup = ''
  
positive.code: , libxml2
  , pango
  , shared_mime_info
  , xorg
  }:
  
  
negative.code:     description = "A file manager for the GNOME desktop";
      homepage = https://wiki.gnome.org/Apps/Nautilus;
      license = with licenses; [
        fdl11
        gpl2Plus
        lgpl2Plus
      ];
  