MarsSeed [1] filed a deletion request for dclib [2]: Orphaned package. Library of AUR/valknut, whose build was reported broken in 2020. (deletion request submitted) Project was abandoned in 2009. It was a legacy Direct Connect filesharing client. But even back then, it didn't support the then-new ADC protocol introduced in 2007. Safe to delete, as it wouldn't be useful even if it could be made to work (incompatible with currently used DC++ filesharing clients). [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/dclib/