Fix compilation issue with some compilers (when doing using Base::foo;, foo must be visible in the direct base class)
Fix compilation issue with some compilers (when doing using Base::foo;, foo must be visible in the direct base class)

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