MarsSeed [1] filed a deletion request for crypto++-562 [2]: This specific legacy version of crypto++ is from 2016. Flagged for failing to build with errors in 2017, hasn't been fixed since. Safe to delete, nothing in AUR depends on it. Arch provides current community/crypto++ package. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/crypto++-562/