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What you put in your CMakeLists.txt depends on what you are doing in your package. If you are just writing a simple node you don't need to export CATKIN_DEPENDS and you don't need to depends on message_generation.
Whereas if you are creating messages like the first tutorial you do need to do those things so the the messages can be generated.
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What you put in your CMakeLists.txt depends on what you are doing in your package. If you are just writing a simple node you don't need to export CATKIN_DEPENDS and you don't need to depends on message_generation.
There's a good summary of what CATKIN_DEPENDS is for in this question
Whereas if you are creating messages like the first tutorial you do need to do those things so the the messages can be generated.
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