Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputClass"
    Identifier "middle button emulation"
    MatchIsPointer "on"
    Option "Emulate3Buttons" "on"
EndSection