Question

I’m trying to use the Eigen C++ template library for linear algebra, I compiled and installed the library to the following path /usr/local/include

I took a sample code from their site and I tried to compile with and without the -l option.

g++ -l /usr/local/include/eigen3 test.cpp -o mytest

but I’m getting the following error:

test.cpp:2:23: fatal error: Eigen/Dense: No such file or directory

How can I include this library?

Answer 1

You want to use the -I option, not -l

g++ -I /usr/local/include/eigen3 test.cpp -o mytest