Xavier NX and opencv3

I have a nx with jetpack4.4 which means opencv4 has been install.
When I install ros melodic on nx,I found opencv3 is not installed.I remember opencv3 will be installed together with ros(melodic) in /usr/include and /usr/lib.But I only find opencv4 in these directories and I don’t know why.
And now I need to run a ros project with opencv3,could you tell me how to install opencv3 and let my ros project find opencv3?
waiting for your help~

The package installed through SDKManager is v4.1.1. For using OpenCV3, you may try to build from source. Please check
GitHub - mdegans/nano_build_opencv: Build OpenCV on Nvidia Jetson Nano

The user shares the script for building from 2.2 to 4.4.0. Please give it a try.

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