message: GUDHI_CAN_USE_CXX11_THREAD_LOCAL was missing in Persistent_cohomology::annotation_of_the_boundary
diff: @@ -300,7 +300,10 @@ class Persistent_cohomology {
  // with multiplicity. We used to sum the coefficients directly in
  // annotations_in_boundary by using a map, we now do it later.
  typedef std::pair<Column *, int> annotation_t;
  - thread_local std::vector<annotation_t> annotations_in_boundary;
  +#ifdef GUDHI_CAN_USE_CXX11_THREAD_LOCAL
  + thread_local
  +#endif // GUDHI_CAN_USE_CXX11_THREAD_LOCAL
  + std::vector<annotation_t> annotations_in_boundary;
  annotations_in_boundary.clear();
  int sign = 1 - 2 * (dim_sigma % 2); // \in {-1,1} provides the sign in the
  // alternate sum in the boundary.
  