Eigen installation
Eigen Installation from source
mkdir spvm_build
mkdir spvm_build/src
mkdir spvm_build/include
curl -L http://bitbucket.org/eigen/eigen/get/3.3.7.tar.gz > spvm_build/src/eigen-eigen-323c052e1731.tar.gz
tar xf spvm_build/src/eigen-eigen-323c052e1731.tar.gz
rsync -a eigen-eigen-323c052e1731/Eigen spvm_build/include