错误1：
By not providing “FindOpenCV.cmake” in CMAKE_MODULE_PATH this project has asked CMake to find a package configuration file provided by “OpenCV”, but
CMake did not find one.
Could not find a package configuration file provided by “OpenCV” with any
of the following names:
OpenCVConfig.cmake
opencv-config.cmake
方法
试过网上修改Cmakelist.txt文件里面的内容无效
后来直接重新对opencv包安装
cd build
cmake …
make -j8
sudo make install
问题就解决了
错误2
error: using typedef-name ‘Ogre::Vector3’
重新到github下载Ogre（版本不要最新的，我的ogre-1.11.2）
mkdir build && cd build
cmake …
make -j8
sudo make install
再跳回刚刚编译的终端重新编译即可
