SLAMBook2 in ch3 code run fatal error: Eigen/Core: No such file or directory

1. First determine whether you have installed eigen3

If not, use the following command to install:

sudo apt-get install libeigen3-dev

2. The installation directory is inconsistent with the directory specified in cmakelists.txt

The default installation directory in cmakelists.txt is as follows:

modify it to the correct path

the final running success is as follows:

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