MuseScore violates the C++ One Definition Rule [-Wodr]

G++ now complains about the following:

I mscore/importmxmlpass1.h                                              R34  <142  C1  1240|4D8 u|0073 17:19

struct PageFormat {
QSizeF size;
qreal printableWidth; // _width - left margin - right margin
qreal evenLeftMargin; // values in inch
qreal oddLeftMargin;
qreal evenTopMargin;
qreal evenBottomMargin;
qreal oddTopMargin;
qreal oddBottomMargin;
bool twosided;
};

typedef QMap PartMap;
typedef std::map MusicXmlPartGroupMap;

I libmscore/read206.h                                                   R24  <91   C1  699 |2BB u|0063 17:19

class PageFormat {
QSizeF _size;
qreal _printableWidth; // _width - left margin - right margin
qreal _evenLeftMargin; // values in inch
qreal _oddLeftMargin;
qreal _evenTopMargin;
qreal _evenBottomMargin;
qreal _oddTopMargin;
qreal _oddBottomMargin;
bool _twosided;

public:
PageFormat() {}

  const QSizeF& size() const          { return _size;          }    // size in inch

This is because PageFormat now has two definitions which are incompatible with each other.