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diff --git a/src/gui/painting/qplatformbackingstore_qpa.cpp b/src/gui/painting/qplatformbackingstore_qpa.cpp
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+++ b/src/gui/painting/qplatformbackingstore_qpa.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <qplatformbackingstore_qpa.h>
+#include <qwindow.h>
+#include <qpixmap.h>
+#include <private/qwindow_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QPlatformBackingStorePrivate
+{
+public:
+    QPlatformBackingStorePrivate(QWindow *w)
+        : window(w)
+    {
+    }
+
+    QWindow *window;
+    QSize size;
+};
+
+/*!
+    \class QPlatformBackingStore
+    \since 5.0
+    \internal
+    \preliminary
+    \ingroup qpa
+
+    \brief The QPlatformBackingStore class provides the drawing area for top-level
+    windows.
+*/
+
+
+/*!
+    \fn void QPlatformBackingStore::beginPaint(const QRegion &region)
+
+    This function is called before painting onto the surface begins,
+    with the \a region in which the painting will occur.
+
+    \sa endPaint(), paintDevice()
+*/
+
+/*!
+    \fn void QPlatformBackingStore::endPaint(const QRegion &region)
+
+    This function is called after painting onto the surface has ended,
+    with the \a region in which the painting was performed.
+
+    \sa beginPaint(), paintDevice()
+*/
+
+/*!
+    \fn void QPlatformBackingStore::flush(QWindow *window, const QRegion &region,
+                                  const QPoint &offset)
+
+    Flushes the given \a region from the specified \a window onto the
+    screen.
+
+    Note that the \a offset parameter is currently unused.
+*/
+
+/*!
+    \fn QPaintDevice* QPlatformBackingStore::paintDevice()
+
+    Implement this function to return the appropriate paint device.
+*/
+
+/*!
+    Constructs an empty surface for the given top-level \a window.
+*/
+QPlatformBackingStore::QPlatformBackingStore(QWindow *window)
+    : d_ptr(new QPlatformBackingStorePrivate(window))
+{
+}
+
+/*!
+    Destroys this surface.
+*/
+QPlatformBackingStore::~QPlatformBackingStore()
+{
+    delete d_ptr;
+}
+
+/*!
+    Returns a pointer to the top-level window associated with this
+    surface.
+*/
+QWindow* QPlatformBackingStore::window() const
+{
+    return d_ptr->window;
+}
+
+void QPlatformBackingStore::beginPaint(const QRegion &)
+{
+}
+
+void QPlatformBackingStore::endPaint()
+{
+}
+
+/*!
+    Scrolls the given \a area \a dx pixels to the right and \a dy
+    downward; both \a dx and \a dy may be negative.
+
+    Returns true if the area was scrolled successfully; false otherwise.
+*/
+bool QPlatformBackingStore::scroll(const QRegion &area, int dx, int dy)
+{
+    Q_UNUSED(area);
+    Q_UNUSED(dx);
+    Q_UNUSED(dy);
+
+    return false;
+}
+
+QT_END_NAMESPACE