sixpindin [1] filed a deletion request for omnisharp [2]: Reasons : 1. maintainer seems to have abandoned 2. actually named incorrectly because the source is omnisharp-roslyn, not omnisharp (legacy) 3. duplicate of omnisharp-roslyn [1] https://aur.archlinux.org/account/sixpindin/ [2] https://aur.archlinux.org/pkgbase/omnisharp/