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diff --git a/src/gui/math3d/qmath3dutil_p.h b/src/gui/math3d/qmath3dutil_p.h
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+++ b/src/gui/math3d/qmath3dutil_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the $MODULE$ of the Qt Toolkit.
+**
+** $TROLLTECH_DUAL_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QMATH3DUTIL_P_H
+#define QMATH3DUTIL_P_H
+
+#include <QtGui/qmath3dglobal.h>
+#include <QtCore/qmath.h>
+
+QT_BEGIN_NAMESPACE
+
+#ifdef QT_GL_FIXED_PREFERRED
+#define qvtsqrt(x)  ((x).sqrtF())
+#else
+#define qvtsqrt(x)  qSqrt((x))
+#endif
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+void qt_math3d_sincos(qreal degrees, qrealinner *s, qrealinner *c);
+
+#ifdef QT_GL_FIXED_PREFERRED
+
+inline qrealinner qf2vt_round(qreal x)
+{
+    QFixedPt<16> result;
+    if (x >= 0.0f)
+        result.setBits(int(x * 65536.0f + 0.5f));
+    else
+        result.setBits(int(x * 65536.0f - 0.5f));
+    return result;
+}
+
+// Helper macros for computing dot products without losing precision.
+// In fixed-point mode, a 64-bit intermediate result is used.
+#define qvtmul64(x,y)   ((qint64((x).bits())) * (qint64((y).bits())))
+#define qvtsqrt64(x)    \
+    (qt_math3d_fixed_sqrt((x) << 16) / (qreal)(1 << 24))
+#define qvtdot64(x)     ((x) / (qreal)(((qint64)1) << 32))
+
+#else
+
+inline qrealinner qf2vt_round(qreal x)
+{
+    return x;
+}
+
+#define qvtmul64(x,y)   ((x) * (y))
+#define qvtsqrt64(x)    (qvtsqrt((x)))
+#define qvtdot64(x)     ((x))
+
+#endif
+
+QT_END_NAMESPACE
+
+#endif