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If you want to use the binary ros apt repository, noetic requires your code to compile with the ubuntu libopencv-dev package, which is opencv version 4.2 in ubuntu 20. Most people install this library from apt.

It takes much more effort for you to use any other version of opencv in noetic. You will need to compile any ros-packages that use opencv from source code, and you will have to debug the problems created by the API changes that the opencv devs make frequently.

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