anchor.diff:        exo
         garcon
         gtk-xfce-engine
  -      gvfs
         libxfce4ui
         tumbler
         xfconf
  
positive.code:       "/share/gtksourceview-2.0"
      ];
  
      environment.variables = {
        GIO_EXTRA_MODULES = [ "${pkgs.xfce.gvfs}/lib/gio/modules" ];
      };
  
      services.xserver.gdk-pixbuf.modulePackages = [ pkgs.librsvg ];
  
      services.xserver.desktopManager.session = [{
  
negative.code:     # Enable helpful DBus services.
      services.udisks2.enable = true;
      services.upower.enable = config.powerManagement.enable;
      services.gvfs.enable = true;
      services.gvfs.package = pkgs.xfce.gvfs;
    };
  }
  