安装opencv3.4
cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local ..
安装 Eigen3.38
安装 Pangolin c++11版本
用c++11编译orb_slam2
cmake -DCMAKE_CXX_STANDARD=11 -DCMAKE_BUILD_TYPE=Release ..
或者set(CMAKE_CXX_STANDARD 11)
如果报错compile error：usleep was not declared in this scope
在System.h中加入#include <unistd.h>
在运行过程中报错
The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support.
解决方法是先卸载opencv，安装上述依赖再重装opencv