編譯build_ros.sh時報錯

主要參考：https://github.com/hxiaoxi/SLAM/blob/master/ROS%20%2B%20ORB_SLAM.mdnode 在ros上編譯build_ros.sh時報錯，出現以下信息：linux Building ROS nodes mkdir: cannot create directory ‘build’: File exists [rosbuild] Build

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