git clone https://github.com/<your-username>/OpenTTD.git openttd
git clone https://github.com/OpenTTD/OpenTTD-git-hooks.git openttd_hooks
cd openttd
git remote add upstream https://github.com/OpenTTD/OpenTTD.git
cd .git/hooks
ln -s -t . ../../../openttd_hooks/hooks/*