/usr/local/include/ceres/internal/integer_sequence_algorithm.h:64:16: error: ‘integer_sequence’ is not a member of ‘std’
 struct SumImpl<std::integer_sequence<T, N, Ns...>> {
                ^
/usr/local/include/ceres/internal/integer_sequence_algorithm.h:64:16: error: ‘integer_sequence’ is not a member of ‘std’
/usr/local/include/ceres/internal/integer_sequence_algorithm.h:64:46: error: wrong number of template arguments (3, should be 1)
 struct SumImpl<std::integer_sequence<T, N, Ns...>> {
                                              ^
/usr/local/include/ceres/internal/integer_sequence_algorithm.h:60:8: note: provided for ‘template<class Seq> struct ceres::internal::SumImpl’
 struct SumImpl;
        ^
/usr/local/include/ceres/internal/integer_sequence_algorithm.h:64:49: error: expected unqualified-id before ‘>’ token
 struct SumImpl<std::integer_sequence<T, N, Ns...>> {