由于找不到OpenCV4而导致编译失败,解决方法:
先查看/usr/include/下有没有opencv相关文件,若没有则查看/usr/local/include/下有没有opencv4文件,如果有则复制到/usr/include/下
sudo cp -r /usr/local/include/opencv4 /usr/include/opencv4
重新编译即可

由于找不到OpenCV4而导致编译失败,解决方法:
先查看/usr/include/下有没有opencv相关文件,若没有则查看/usr/local/include/下有没有opencv4文件,如果有则复制到/usr/include/下
sudo cp -r /usr/local/include/opencv4 /usr/include/opencv4
重新编译即可