Compilation in Pi4 on Raspbian 10.7

[janisbvp]

I was thrilled to find this project to adopt for people counting, as required for every small shop this time.
Sadly, I only have Pi4 board with camera, that only accepts fresh linux install and has "latest and greatest" of OpenCV, GCC and so on.
Has anyone had any luck compiling on a fresh platform?
I am hitting all possible errors and since I am not programmer but sysadmin, feels like hitting wall.

I have managed to combat locations and 'includes' but now, that newer OpenCV is just killing me:
/home/pi/openFrameworks/apps/myApps/Footfall/src/CameraManager.cpp:43:9: error: ‘class cv::BackgroundSubtractorMOG2’ has no member named ‘setDouble’ pMOG2->setDouble("fTau", _cameraConfig.shadowPixelRatio); ^~~~~~~~~ /home/pi/openFrameworks/apps/myApps/Footfall/src/CameraManager.cpp: In member function ‘void CameraManager::update()’: /home/pi/openFrameworks/apps/myApps/Footfall/src/CameraManager.cpp:104:20: error: ‘class cv::BackgroundSubtractorMOG2’ has no member named ‘operator()’ pMOG2->operator()(combinedMask,processedMog); ^ /home/pi/openFrameworks/apps/myApps/Footfall/src/CameraManager.cpp:108:20: error: ‘class cv::BackgroundSubtractorMOG2’ has no member named ‘operator()’ pMOG2->operator()(videoMatrix,processedMog);

I am using Raspbian lite, but don't think that this is the issue.