fatal error: Eigen/Core: No such file or directory compilation terminated

Question

I recently change my OS to the last mint cinamon. Compiling one of the library I need (and that I used to used without problem), I get this message:

fatal error: Eigen/Core: No such file or directory compilation terminated.

I don't know what to do. Thanks for the help.

Answer 1

Including directory /usr/local/include/eigen3/ solved this for me.

Like this, for example:

g++ -I/usr/local/include/eigen3/ CODE.cpp -o EXECUTABLE

Answer 2

Try to install eigen3 library,

on Ubuntu it would be

sudo apt-get install libeigen3-dev