El Capitan - Enable Tap-to-click on login screen I want to enable Tap-to-click for my trackpad on the login screen of my MacBook Pro with El Capitan 10.11.6 (15G1004).

I tried everything proposed on this old question but nothing has worked.

Could you help me please?
I just tried this and it worked on Sierra but should work on older versions too... The internal trackpad uses a different driver (USB) so need to enable a different default

sudo defaults write com.apple.AppleMultitouchTrackpad Clicking 1