官网上的编译说明：

rosdep install --from-paths src --ignore-src --rosdistro=${ROS_DISTRO} -y

会报错：

ERROR: the following packages/stacks could not have their rosdep keys resolved
to system dependencies:
cartographer: No definition of [eigen] for OS version []

解决方法：

1. 用 lsb_release -a
查看自己的ubuntu版本号

2. rosdep update rosdep install --from-paths src --ignore-src --rosdistro=${ROS_DISTRO} -y --os=ubuntu:xenia