error: #error “Please include Eigen/Geometry instead of including headers inside the src directory d
1-error 
2-solution
prompt us to \include < Eigen/Geometry>, the header file related to vim should under Panglin/include/pangolin/plot/rang.h 
but a new error is reported. There is no such file or directory as eigen/geometry
Solution:
cd /usr/include
sudo ln -sf eigen3/Eigen Eigen
sudo ln -sf eigen3/unsupported unsupported