synclient TapButton1=1 LBCornerButton=2 RBCornerButton=3 MaxTapTime=140 SingleTapTimeout=140 MaxDoubleTapTime=140
#or
/usr/share/X11/xorg.conf.d/50-synaptics.conf
Section "InputClass"
Identifier "touchpad catchall"
Driver "synaptics"
MatchIsTouchpad "on"
Option "TapButton1" "1"
Option "RBCornerButton" "3"
EndSection
