How to build OpenCv 3.4 on Jetson Nano

Hello

I need to install openCv 3.4 on my Jetson Nano. I have tried this without success according to the following instructions.
https://linuxize.com/post/how-to-install-opencv-on-ubuntu-18-04/
Are there any specific instructions for the Jetson Nano?

Thanks for the help

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