this is the error reported by pacman

error: xorg-xwayland: signature from "Eric Vidal <eric@ obarun.org>" is invalid
:: File /var/cache/pacman/pkg/xorg-xwayland-xwayland.21.1.1-2-x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
It was a temporary problem with the repo and it was fixed, synch -Sy and upgrade/build. I suppose you tried building wlroots and if you have xorg installed you must have had a copy of it in your cache.

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