error: usleep is not declared in this scope

Find every file which have this error and add the codes below to it:

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>



in case of orbslam2:

Files that need to be added are:

Examples/Monocular/mono_euroc.cc

Examples/Monocular/mono_kitti.cc

Examples/Monocular/mono_tum.cc

Examples/RGB-D/rgbd_tum.cc

Examples/Stereo/stereo_euroc.cc

Examples/Stereo/stereo_kitti.cc

src/LocalMapping.cc

src/LoopClosing.cc

src/System.cc

src/Tracking.cc

src/Viewer.cc