#include <QtGui/qstyleoption.h>
#ifndef QSTYLEOPTION_H
class QStyleOptionHeader: public QStyleOption{
   /* Some contents are skipped to improve readability */
   public: enum SortIndicator{
      /* ... */
      SortDown = 2,
      /* ... */
   };
   /* ... */
};
#endif // QSTYLEOPTION_H