FFEA will no longer compile with eigen 3.3~beta1-2

[Robert Welch]

Checked on my workstation, which is using the newer eigen 3.3-beta2 from summer 2016. Works fine. However, Ubuntu still ships beta 1-2 (whatever that means). Looks like there have been some changes to SelfAdjointEigenSolver.h in 3.3-beta2.

The error is on line 2174 of world.cpp

Eigen::SelfAdjointEigenSolver<Eigen_MatrixX> es(A);

The readme file still specifies that FFEA needs Eigen >= 3.2.1.

[Albert Solernou Crusat]

Sorted out. The problem was known but the install notes were not clear. They are clearer now, and the configure process under CMake will crash informing of the incompatibility.