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I have noticed that each time I open up a new terminal, I have to
source /opt/ros/kinetic/setup.bash
yes, that is needed in every terminal (or really: bash instance)
and execute catkin_make
No, that should not be needed.
why do I have to source and execute catkin_make again?
This question has been posted and answered quite a few times already. See the following for related / duplicate questions: #q124131, #q239131, #q229365, #q188309 and #q200174.
And the following questions try to explain why this is needed: #q241528, #q251292 and #q252715.
In short: setup.bash configures your shell so that it can find ROS programs and lets those programs find the required ROS packages.
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