make sure that changing CMAKE_INSTALL_PREFIX is properly taken into account
make sure that changing CMAKE_INSTALL_PREFIX is properly taken into account

rotorliu/eigen,mjbshaw/Eigen,rotorliu/eigen,rotorliu/eigen,madlib/eigen_backup,rotorliu/eigen,mjbshaw/Eigen,madlib/eigen_backup,mjbshaw/Eigen,madlib/eigen_backup,madlib/eigen_backup,mjbshaw/Eigen