MarsSeed [1] filed a deletion request for yubico-c-client-git [2]: Abandoned package from 2015; dead due to unsupported GitHub source URL since 2022-03.
Development discontinued since 3+ years ago, GitHub repo is archived. [a] [a]: https://github.com/Yubico/yubico-c-client [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/yubico-c-client-git/
