message: Removed errnous const qualifier.
diff: @@ -444,7 +444,7 @@ private:
  description by Bangerth.
  */
  std::function<double(ParMesh*, const int)> compute_element_coefficient = [](
  - const ParMesh* pmesh, const int e)
  + ParMesh* pmesh, const int e)
  {
  // Obtain jacobian of the transformation.
  DenseMatrix J;
  