anchor.diff:            Enable scrolling while holding the middle mouse button.
           '';
         };
  -      
  +
       };
   
     };
  
positive.code:         ''
            Section "InputClass"
              Identifier "Trackpoint Wheel Emulation"
              MatchProduct "TPPS/2 IBM TrackPoint|DualPoint Stick|Synaptics Inc. Composite TouchPad / TrackPoint|ThinkPad USB Keyboard with TrackPoint|USB Trackpoint pointing device|Composite TouchPad / TrackPoint"
              MatchDevicePath "/dev/input/event*"
              Option "EmulateWheel" "true"
              Option "EmulateWheelButton" "2"
  
negative.code:           Enable sensitivity and speed configuration for trackpoints.
          '';
        };
  
        sensitivity = mkOption {
          default = 128;
          example = 255;
  