message: Adding hypre version checks.
diff: @@ -1893,8 +1893,9 @@ HypreParMatrix * HypreParMatrixFromBlocks(Array2D<HypreParMatrix*> &blocks,
  {
  const int nrows = csr_blocks(i, j)->num_rows;
  const double cij = blockCoeff ? (*blockCoeff)(i, j) : 1.0;
  -
  +#if MFEM_HYPRE_VERSION >= 21600
  const bool usingBigJ = (csr_blocks(i, j)->big_j != NULL);
  +#endif
  for (int k = 0; k < nrows; ++k)
  {
  @@ -1905,8 +1906,12 @@ HypreParMatrix * HypreParMatrixFromBlocks(Array2D<HypreParMatrix*> &blocks,
  for (int l = 0; l < nnz_k; ++l)
  {
  // Find the column process offset for the block.
  +#if MFEM_HYPRE_VERSION >= 21600
  const int bcol = usingBigJ ? csr_blocks(i, j)->big_j[osk + l]
  : csr_blocks(i, j)->j[osk + l];
  +#else
  + const int bcol = csr_blocks(i, j)->j[osk + l];
  +#endif
  int bcolproc = 0;
  for (int p = 1; p < nprocs; ++p)
  