message: fix mhs compile error
diff: @@ -114,7 +114,9 @@ std::shared_ptr<Operator> MakeOperator(const std::string &type,
  }
  else if (typeLowerCase == "sirius")
  {
  +#ifdef ADIOS2_HAVE_MHS
  ret = std::make_shared<compress::CompressSirius>(parameters);
  +#endif
  }
  else if (typeLowerCase == "sz")
  {
  