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I solved it. It was a silly mistake.

I was setting up OPENCV_EXTRA_MODULES_PATH as: cmake -D OPENCV_EXTRA_MODULES_PATH=../opencv_contrib/modules ..

But my working directory was "opencv/build/" (I was in a directory "build" inside of opencv and the "opencv_contrib" was in the same directory as "opencv"), so that variable should have been: cmake -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules ..