PS: I was thinking that since compiling the latest version on git
works (4.5, on https://github.com/opencv/opencv.git), can we try
putting this in CinGG git? I mean instead of the current version 3.
The whole reason for not updating OpenCV is because of licensing with the Surf algorithm which is necessary for FindObj to work well. The later versions (at that time) had the Surf algorithm removed as no longer non-free. So if you can verify that Surf is again free and part of the released OpenCV version 4.5, then we can certainly upgrade and that would be very good.