message: this hack is no longer needed and actually dangerous...
diff: // class TObject{};
  -#ifdef ClassDef
  -#undef ClassDef
  -#endif //ClassDef
  -
  -#ifdef ClassTmp
  -#undef ClassTmp
  -#endif //ClassTmp
  -
  #define ClassDef(name,id)
  #define ClassImp(name)
  