PKGBUILD script for installing PortProton on arch-based distros.
git clone https://aur.archlinux.org/portproton.git
cd portproton
makepkg -sci
If you use GNOME, you will also need icoextract to display icons.
git clone https://aur.archlinux.org/icoextract.git
cd icoextract
makepkg -sci
yay -S portproton
If you use Manjaro or Manjaro based distros, you will also need base-devel for build packages.
sudo pacman -S base-devel