opencv2/nonfree/nonfree.hpp：没有那个文件或目录

致命错误： opencv2/nonfree/nonfree.hpp：没有那个文件或目录
fatal error: opencv2/nonfree/nonfree.hpp: No such file or directory

解决方法：

sudo apt-get update
sudo add-apt-repository --yes ppa:xqms/opencv-nonfree
sudo apt-get update
sudo apt-get install libopencv-nonfree-dev