MarsSeed [1] filed a deletion request for ros-melodic-slime-ros [2]: Dead, EOL package from 2021.
The build tries to execute a script (fix-python-scripts.sh) from ros- build-tools, which the latter no longer carries. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/ros-melodic-slime-ros/
