title: Eigen and CImg compatibility issues
body: <p>So, I'm trying to record and display an image using CImg but I'm also using a linear algebra library called Eigen. Coincidentally, they each seem to have a macro with the same name, "Success". I've tried doing an #undef but that didn't work out smoothly. So whenever I try to compile, I get this error that "Success" is defined twice in different files. How should I go about removing this error without losing either macro? Help is much appreciated!</p>