MarsSeed [1] filed a deletion request for valknut [2]: Orphaned package. Build reported broken in 2020.
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/valknut/