git clone https://github.com/ros/catkin.git

要克隆https://github.com/ros/catkin.git的git仓库，您可以在工作空间的src路径下执行以下命令行：

$ git clone https://github.com/ros/catkin.git

这将克隆catkin的git仓库到您的工作空间中的src文件夹中。请确保您的网络连接正常，并且您具有克隆该仓库所需的权限。如果您遇到任何错误，请检查您的网络连接和权限设置。
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