git clone ssh://aur@aur.archlinux.org/package_name.git
Prototype files are in /usr/share/pacman
updpkgsums
makepkg --printsrcinfo > .SRCINFO
namcap PKGBUILD
Install devtools
first.
See https://wiki.archlinux.org/title/DeveloperWiki:Building_in_a_clean_chroot
extra-x86_64-build
updpkgsums && makepkg --printsrcinfo > .SRCINFO && namcap PKGBUILD && makepkg -f
makepkg -i