寫一下我的安裝gridmap的心酸淚

a：首先出現 Could not find a package configuration file provided by 「ros_pcl" with any of the following names: ros_pclConfig.cmake ros_pcl-config.cmake 然後我以爲是pcl沒有安裝好，就努力的安裝pcl，中間有步驟會刪除ros的一些東西，你得重新搞回來， pc

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