porting catalog to Qt5

[saman_artorious]

Unfortunately, catalog is not ported to qt5, only smarthouse and patientcare are.
when I change the headers of catalog I get the following error:

error: invalid use of incomplete type 'struct QWindowsStyle'
error: forward declaration of 'struct QWindowsStyle'

error: invalid use of incomplete type 'struct QWindowsStyle'
error: forward declaration of 'struct QWindowsStyle'

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clicking error brings me here:

#ifndef QMENUBAR_H
#define QMENUBAR_H
 
#include <QtWidgets/qmenu.h>
 
QT_BEGIN_HEADER
 
QT_BEGIN_NAMESPACE
 
#ifndef QT_NO_MENUBAR
 
class QMenuBarPrivate;
class QStyleOptionMenuItem;
class QWindowsStyle;
class QPlatformMenuBar;

#ifndef QMENUBAR_H
#define QMENUBAR_H

#include <QtWidgets/qmenu.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

#ifndef QT_NO_MENUBAR

class QMenuBarPrivate;
class QStyleOptionMenuItem;
class QWindowsStyle;
class QPlatformMenuBar;

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I searched for the headers as well, but couldn't find it in QtWidgets/...

anyone faced this before?