title: How to add Eigen library to c++ project
body: <p>Probably a dumb / simple question, but I have not been able to find an answer. I have no clue how adding libraries works with CodeBlocks c++. I downloaded the .zip file from <a href="http://eigen.tuxfamily.org/index.php?title=Main_Page" rel="noreferrer">http://eigen.tuxfamily.org/index.php?title=Main_Page</a> and extracted the files into my directory. How can I use this library now in my project?</p>