MarsSeed [1] filed a deletion request for ros-noetic-libviso2 [2]: Unmaintained, unused, obsolete VCS package in disguise from 2020. Upstream is EOL since 2024. ROS1 (Noetic) packages are also all EOL, and no longer compatible with Arch Linux, only with Python 3.9, Qt 5.12 and the freshly EOL Ubuntu 20.04 LTS. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/ros-noetic-libviso2/