message: operator& is now public (needed for gcc5.4)
diff: @@ -70,9 +70,9 @@ class AliXMLEngine : public TObject {
  }
  bool operator!=(reference other) const { return fPtr != other.fPtr; }
  reference operator*() const { return *this; }
  + pointer operator&() const { return fPtr; }
  protected:
  - pointer operator&() const { return fPtr; }
  TXMLEngine *fXML; //!
  private:
  pointer fPtr; //!
  