Avogadro-1.0 appears to be one of the last package still using the
Eigen2 interface (which we switched it to Eigen3 with -DEIGEN2_SUPPORT a
while ago), and which will be removed in Eigen 3.3, see bug
Will there be a Avogadro-1.0.4 release with a backported Eigen3
interface at some point?
Or will there be a stable Avogadro-1.2 at some point?