How to activate right-click function on clickpad?

Finally, I can use the right-click of the clickpad on my laptop (HP Pavilion dv3-4036TX). Clickpad is differ from touchpad, those are, it is larger than touchpad and it doesn't have physical buttons for left- and right-click (see picture below and click here for more detail).

Because of this construction, if we use common driver (synaptics) on linux, you cannot use right-click function, in other word, when you click on both left and right bottom side of clickpad, you will get left-click function only.

If you want to activate right-click function, you have to patch the xf86-input-synaptics driver. You can download the patch from this site. How to patch? Follow the steps below:

1. Download the source of x11 (the whole directory tree) from Slackware site. It's better if you use rsync command for downloading it. In my case, I use: rsync -avP rsync.osuosl.org::slackware/slackware64-current/source/x/x11 /home/henry/rsync/
2. Copy the patch to path-to/x11/patch/xf86-input-synaptics/. In my case, I copy it to /home/henry/rsync/x11/patch/xf86-input-synaptics/.
3. Add this line: patch -p1 < $CWD/patch/xf86-input-synaptics/synaptics-clickpad-support.patch --verbose || { touch ${SLACK_X_BUILD_DIR}/${PKGNAME}.failed ; continue ; } to path-to/x11/patch/xf86-input-synaptics.patch then save it. In my case, I add that line to /home/henry/rsync/x11/patch/xf86-input-synaptics.patch file.
4. Run the slackbuild script exactly like this: ./x11.slackbuild driver xf86-input-synaptics
5. You will get new slackware package of xf86-input-synaptics for your clickpad. Afterward, upgrade the existing xf86-input-synaptics with the new one using upgradepkg.
6. Make new file (you can name it freely) in /etc/X11/xorg.conf.d/ (in my case: /etc/X11/xorg.conf.d/clickpad.conf), then write these lines in the file then save it:

Section "InputClass"
        Identifier "touchpad catchall"
        Driver "synaptics"
        MatchIsTouchpad "on"
          Option "TapButton1" "1"
          Option "TapButton2" "2"
          Option "TapButton3" "3"
EndSection

Restart X server, then enjoy your "right-click function" of clickpad if you click the right bottom area of clickpad. In addition, if you click the middle bottom area of clickpad, you will get "middle-button function".