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The problem was in the sourcing, I added the workspace effectively overwritting the ros/melodic/share installed by the original source of /opt/ros/melodic/setup.bash. So far my solution is to add the individual packages of the catkin ws instead of directly sourcing the ws. So add to .bashrc "export ROS_PACKAGE_PATH=path/to/your_package:$ROS_PACKAGE_PATH" as mentioned in one of the old tutorials. This allows the complete rqt library to exist alongside your custom packages within your ros environnment.