MarsSeed [1] filed a deletion request for ros-noetic-roscpp-core [2]: Fails to build. Obsolete orphan package from 2021.
Not compatible with Arch Linux, only with the EOL Ubuntu 20.04 LTS. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/ros-noetic-roscpp-core/
