Hendrikto [1] filed a deletion request for gcc81-raspi4-xmrig [2]: The underlying problem for introducing this package has been fixed (https://github.com/xmrig/xmrig/pull/2177), and the only package depending on this has already been deleted.
[1] https://aur.archlinux.org/account/Hendrikto/ [2] https://aur.archlinux.org/pkgbase/gcc81-raspi4-xmrig/
