MarsSeed [1] filed a deletion request for alsa-sndio [2]: Discontinued in 2018. Orphaned package. This was a 'reverse plugin' to redirect ALSA input to SNDIO output. That's an odd thing to want. Though nothing is impossible, this does not seem to be very practicable or in high demand. Upstream SNDIO supports ALSA as a backend. That seems to be the way SNDIO is used, not the other way around. Nothing depends on this abandoned package so I think it's safe to delete. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/alsa-sndio/