Jetson Nano Opencv ,C++

Hello, I installed OPENCV 4.5.0 on Jetson nano with Cuda and cuDNN. Everything ok. But I typed an example opencv but could not combi. How do I do it? I am getting the following error.

main.cpp: 1: 10: fatal error: opencv2 / opencv.hpp: no such file or directory #include compilation terminated.

I get the same error on Qt. I think I need to introduce the library. How am I going to solve this problem?

I don’t have much experience on this case, you may try to find he answer from https://forum.opencv.org

Maybe your setup can not linked right directions of OpenCV files.
If you share some details about your environment to help further, we can help you better
Best wishes