MarsSeed [1] filed a deletion request for librenms [2]: Abandoned, broken package from 2020.
As per former maintainer's explanation in the pinned comment, it is very difficult to make and keep this working, due to specific dependency constraints. It is better to install it in a Docker container, as last user comment suggests. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/librenms/
