# 二. Issues
# 1. 解决 fatal error: Eigen/Core: No such file or directory
参考连接:https://www.cnblogs.com/long5683/p/13406666.html
1)确认是否安装了eigen3
sudo apt-get install libeigen3-dev
解决 fatal error: Eigen/Core: No such file or directory
2)如果已经安装,但当调用 eigen 库时,报错:fatal error: Eigen/Core: No such file or directory
这是因为 eigen 库默认安装在了 /usr/include/eigen3/Eigen 路径下,需使用下面命令映射到 /usr/include 路径下
sudo ln -s /usr/include/eigen3/Eigen /usr/include/Eigen