MarsSeed [1] filed a deletion request for ardupilot-gazebo-sitl-git [2]: Fails to build. Upstream repo is archived. [a] Successor library's CMake project name is 'ardupilot_gazebo' [b] instead of the old one's name, 'ardupilot_sitl_gazebo'. [c] [a]: http://github.com/khancyr/ardupilot_gazebo [b]: http://github.com/ArduPilot/ardupilot_gazebo/blob/main/CMakeLists.txt [c]: http://github.com/khancyr/ardupilot_gazebo/blob/master/CMakeLists.txt [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/ardupilot-gazebo-sitl-git/