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diff --git a/qmake/include/private/qinternal_p.h b/qmake/include/private/qinternal_p.h
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+++ b/qmake/include/private/qinternal_p.h
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+/****************************************************************************
+** $Id$
+**
+** Definition of some shared interal classes
+**
+** Created : 010427
+**
+** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
+**
+** This file is part of the kernel module of the Qt GUI Toolkit.
+**
+** This file may be distributed under the terms of the Q Public License
+** as defined by Trolltech AS of Norway and appearing in the file
+** LICENSE.QPL included in the packaging of this file.
+**
+** This file may be distributed and/or modified under the terms of the
+** GNU General Public License version 2 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.
+**
+** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
+** licenses may use this file in accordance with the Qt Commercial License
+** Agreement provided with the Software.
+**
+** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+**
+** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
+**   information about Qt Commercial License Agreements.
+** See http://www.trolltech.com/qpl/ for QPL licensing information.
+** See http://www.trolltech.com/gpl/ for GPL licensing information.
+**
+** Contact info@trolltech.com if any conditions of this licensing are
+** not clear to you.
+**
+**********************************************************************/
+
+#ifndef QINTERNAL_P_H
+#define QINTERNAL_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of a number of Qt sources files.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+//
+#ifndef QT_H
+#include <qnamespace.h>
+#include <qrect.h>
+#endif // QT_H
+
+class QWidget;
+class QPainter;
+class QPixmap;
+
+class Q_EXPORT QSharedDoubleBuffer
+{
+public:
+    enum DoubleBufferFlags {
+        NoFlags         = 0x00,
+                InitBG  = 0x01,
+                Force   = 0x02,
+                Default         = InitBG | Force
+    };
+    typedef uint DBFlags;
+
+    QSharedDoubleBuffer( DBFlags f = Default );
+    QSharedDoubleBuffer( QWidget* widget,
+                         int x = 0, int y = 0, int w = -1, int h = -1,
+                         DBFlags f = Default );
+    QSharedDoubleBuffer( QPainter* painter,
+                         int x = 0, int y = 0, int w = -1, int h = -1,
+                         DBFlags f = Default );
+    QSharedDoubleBuffer( QWidget *widget, const QRect &r, DBFlags f = Default );
+    QSharedDoubleBuffer( QPainter *painter, const QRect &r, DBFlags f = Default );
+    ~QSharedDoubleBuffer();
+
+    bool begin( QWidget* widget, int x = 0, int y = 0, int w = -1, int h = -1 );
+    bool begin( QPainter* painter, int x = 0, int y = 0, int w = -1, int h = -1);
+    bool begin( QWidget* widget, const QRect &r );
+    bool begin( QPainter* painter, const QRect &r );
+    bool end();
+
+    QPainter* painter() const;
+
+    bool isActive() const;
+    bool isBuffered() const;
+    void flush();
+
+    static bool isDisabled() { return !dblbufr; }
+    static void setDisabled( bool off ) { dblbufr = !off; }
+
+    static void cleanup();
+
+private:
+    enum DoubleBufferState {
+                Active  = 0x0100,
+                BufferActive= 0x0200,
+                ExternalPainter= 0x0400
+    };
+    typedef uint DBState;
+
+    QPixmap *getPixmap();
+    void releasePixmap();
+
+    QWidget *wid;
+    int rx, ry, rw, rh;
+    DBFlags flags;
+    DBState state;
+
+    QPainter *p, *external_p;
+    QPixmap *pix;
+
+    static bool dblbufr;
+};
+
+inline bool QSharedDoubleBuffer::begin( QWidget* widget, const QRect &r )
+{ return begin( widget, r.x(), r.y(), r.width(), r.height() ); }
+
+inline bool QSharedDoubleBuffer::begin( QPainter *painter, const QRect &r )
+{ return begin( painter, r.x(), r.y(), r.width(), r.height() ); }
+
+inline QPainter* QSharedDoubleBuffer::painter() const
+{ return p; }
+
+inline bool QSharedDoubleBuffer::isActive() const
+{ return ( state & Active ); }
+
+inline bool QSharedDoubleBuffer::isBuffered() const
+{ return ( state & BufferActive ); }
+
+
+class QVirtualDestructor {
+public:
+    virtual ~QVirtualDestructor() {}
+};
+
+template <class T>
+class QAutoDeleter : public QVirtualDestructor {
+public:
+    QAutoDeleter( T* p ) : ptr( p ) {}
+    ~QAutoDeleter() { delete ptr; }
+private:
+    T* ptr;
+};
+
+template <class T>
+QAutoDeleter<T>* qAutoDeleter( T* p )
+{
+    return new QAutoDeleter<T>( p );
+}
+#endif // QINTERNAL_P_H