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I'm guess, this is because of OpenCV doesn't installed (not executed make install, after you built it). So, you should manually set this variable to OpenCV build folder.

I'm My guess, this is because of OpenCV doesn't installed (not executed make install, after you built it). So, you should manually set this variable to OpenCV build folder.

My guess, this is because of You should set the OpenCV doesn't installed (not executed make installenviroment variable and add it to the systems path, after as described in installation tutorial. Also, you built it). So, you should can manually set this variable to OpenCV build folder.folder in CMake.