Debian Touchpad Tap-to-Click

To enable tap-to-click for Synaptic touchpads (including BCM5974 in MacBook Pro) for Debian Wheezy:

su
mkdir /etc/X11/xorg.conf.d
cp /usr/share/X11/xorg.conf.d/50-synaptics.conf  /etc/X11/xorg.conf.d/
nano /etc/X11/xorg.conf.d/50-synaptics.conf

Section "InputClass"
 ...
 Driver "Synaptics"
 ...
 option "TapButton1" "1"
 ...

Restart X.