Install OpenCV 4.1.1 on Raspbian Buster
$ chmod +x *.sh
$ ./download-opencv.sh
$ ./install-deps.sh
$ ./build-opencv.sh
$ cd ~/opencv/opencv-4.1.1/build
## For success python compile need to add -latomic manually to link.txt
#https://github.com/opencv/opencv/issues/15192