ubuntu 22.04 编译 ORBSLAM3

源码地址（带注释）：ORBSLAM3

1. 根据你安装的openCv版本修改cmake
   修改2个文件的2个地方：
   ORB_SLAM3_detailed_comments-master/CMakeLists.txt
   ORB_SLAM3_detailed_comments-master/Thirdparty/DBoW2/CMakeLists.txt
   查找openCv的地方，更具你自己的版本修改

set(CMAKE_PREFIX_PATH /home/rog/my_file/other_LIB/my_opencv/opencv-4.4.0/my_lib_x86/lib/cmake/opencv4)  # 你自己opencv路径
FIND_PACKAGE(OpenCV 4.4.0 REQUIRED)
INCLUDE_DIRECTORIES(${OpenCV_INCLUDE_DIRS})

2. 修改ORB_SLAM3_detailed_comments-master/CMakeLists.txt的C++版本

set( CMAKE_CXX_FLAGS "-std=c++14" )

上面两步修改参考：

3. 添加宏
ADD_DEFINITIONS(-DCOMPILEDWITHC11)
不添加会报如下C++版本不兼容的如下错误：

error: ‘std::chrono::monotonic_clock’ has not been declared