MarsSeed [1] filed a deletion request for ros-melodic-catkin [2]: All ROS Melodic packages are broken on AUR since mid-2023.
Also ROS Melodic is EOL since same time. As of now, every remaining ros-melodic-* packages are submitted for deletion. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/ros-melodic-catkin/
