Replace unset() by set() with no value specified; this does the same. unset() was introduced in CMake 2.6.3 but we require only 2.6.2.
Replace unset() by set() with no value specified; this does the same.
unset() was introduced in CMake 2.6.3 but we require only 2.6.2.

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