Clone the repo
git clone https://github.com/chrisaq/linux-klgd.git
cd linux-klgd
Build package
makepkg -s
Press 'm' when asked about adding klgd during build
sudo pacman -U linux-klgd-4.3-1-x86_64.pkg.tar.xz
Used the default kernel image package as base:
https://projects.archlinux.org/svntogit/packages.git/tree/trunk?h=packages/linux
If build fails because of missing public key, add this:
gpg --keyserver pgp.mit.edu --recv-keys 79BE3E4300411886
Based on this guide:
https://github.com/Eliasvan/Linux-Force-Feedback/wiki/Logitech-gaming-devices-using-KLGD