Per https://www.chiefdelphi.com/t/cpp-multicameraserver-wont-build/375965/7, GRIP generates code that uses LineSegmentDetector. Per https://github.com/opencv/opencv_contrib/issues/2016, LineSegmentDetector used Affero GPL v3 code and was removed. GRIP needs to remove the calls to LineSegmentDetector or relicense to a compatible license.