anchor.diff:        };
   
         debug = mkEnableOption "gnome-session debug messages";
  -    };  
  +    };
   
       environment.gnome3.packageSet = mkOption {
         default = null;
  
positive.code:     hardware.bluetooth.enable = mkDefault true;
      services.xserver.libinput.enable = mkDefault true; # for controlling touchpad settings via gnome control center
      services.udev.packages = [ pkgs.gnome3.gnome_settings_daemon ];
  
      fonts.fonts = [ pkgs.dejavu_fonts pkgs.cantarell_fonts ];
  
  
negative.code:       description = "Which GNOME 3 package set to use.";
        apply = p: if p == null then pkgs.gnome3 else p;
      };
  
      environment.gnome3.excludePackages = mkOption {
        default = [];
        example = literalExample "[ pkgs.gnome3.totem ]";
  