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diff --git a/src/declarative/qml/qperformancetimer.cpp b/src/declarative/qml/qperformancetimer.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative 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 "qperformancetimer_p.h"
+
+#if defined(Q_OS_MAC)
+#include <sys/time.h>
+#include <unistd.h>
+#include <mach/mach_time.h>
+#elif defined(Q_OS_SYMBIAN)
+#include <e32std.h>
+#include <sys/time.h>
+#include <hal.h>
+#include <hal_data.h>
+#elif defined(Q_OS_UNIX)
+#include <sys/time.h>
+#include <time.h>
+#include <unistd.h>
+#elif defined(Q_OS_WIN)
+#include <windows.h>
+#endif
+
+// mac/unix code heavily copied from QElapsedTimer
+
+QT_BEGIN_NAMESPACE
+
+////////////////////////////// Mac //////////////////////////////
+#if defined(Q_OS_MAC)
+
+static mach_timebase_info_data_t info = {0,0};
+static qint64 absoluteToNSecs(qint64 cpuTime)
+{
+    if (info.denom == 0)
+        mach_timebase_info(&info);
+    qint64 nsecs = cpuTime * info.numer / info.denom;
+    return nsecs;
+}
+
+void QPerformanceTimer::start()
+{
+    t1 = mach_absolute_time();
+}
+
+qint64 QPerformanceTimer::elapsed() const
+{
+    uint64_t cpu_time = mach_absolute_time();
+    return absoluteToNSecs(cpu_time - t1);
+}
+
+////////////////////////////// Symbian //////////////////////////////
+#elif defined(Q_OS_SYMBIAN)
+
+static qint64 getTimeFromTick(quint64 elapsed)
+{
+    static TInt freq = 0;
+    if (!freq)
+        HAL::Get(HALData::EFastCounterFrequency, freq);
+
+    return (elapsed * 1000000000) / freq;
+}
+
+void QPerformanceTimer::start()
+{
+    t1 = User::FastCounter();
+}
+
+qint64 QPerformanceTimer::elapsed() const
+{
+    return getTimeFromTick(User::FastCounter() - t1);
+}
+
+
+////////////////////////////// Unix //////////////////////////////
+#elif defined(Q_OS_UNIX)
+
+#if defined(QT_NO_CLOCK_MONOTONIC) || defined(QT_BOOTSTRAPPED)
+// turn off the monotonic clock
+# ifdef _POSIX_MONOTONIC_CLOCK
+#  undef _POSIX_MONOTONIC_CLOCK
+# endif
+# define _POSIX_MONOTONIC_CLOCK -1
+#endif
+
+#if (_POSIX_MONOTONIC_CLOCK-0 != 0)
+static const bool monotonicClockChecked = true;
+static const bool monotonicClockAvailable = _POSIX_MONOTONIC_CLOCK > 0;
+#else
+static int monotonicClockChecked = false;
+static int monotonicClockAvailable = false;
+#endif
+
+#ifdef Q_CC_GNU
+# define is_likely(x) __builtin_expect((x), 1)
+#else
+# define is_likely(x) (x)
+#endif
+#define load_acquire(x) ((volatile const int&)(x))
+#define store_release(x,v) ((volatile int&)(x) = (v))
+
+static void unixCheckClockType()
+{
+#if (_POSIX_MONOTONIC_CLOCK-0 == 0)
+    if (is_likely(load_acquire(monotonicClockChecked)))
+        return;
+
+# if defined(_SC_MONOTONIC_CLOCK)
+    // detect if the system support monotonic timers
+    long x = sysconf(_SC_MONOTONIC_CLOCK);
+    store_release(monotonicClockAvailable, x >= 200112L);
+# endif
+
+    store_release(monotonicClockChecked, true);
+#endif
+}
+
+static inline void do_gettime(qint64 *sec, qint64 *frac)
+{
+#if (_POSIX_MONOTONIC_CLOCK-0 >= 0)
+    unixCheckClockType();
+    if (is_likely(monotonicClockAvailable)) {
+        timespec ts;
+        clock_gettime(CLOCK_MONOTONIC, &ts);
+        *sec = ts.tv_sec;
+        *frac = ts.tv_nsec;
+        return;
+    }
+#endif
+    *sec = 0;
+    *frac = 0;
+}
+
+void QPerformanceTimer::start()
+{
+    do_gettime(&t1, &t2);
+}
+
+qint64 QPerformanceTimer::elapsed() const
+{
+    qint64 sec, frac;
+    do_gettime(&sec, &frac);
+    sec = sec - t1;
+    frac = frac - t2;
+
+    return sec * Q_INT64_C(1000000000) + frac;
+}
+
+////////////////////////////// Windows //////////////////////////////
+#elif defined(Q_OS_WIN)
+
+static qint64 getTimeFromTick(quint64 elapsed)
+{
+    static LARGE_INTEGER freq;
+    if (!freq.QuadPart)
+        QueryPerformanceFrequency(&freq);
+    return 1000000000 * elapsed / freq.QuadPart;
+}
+
+void QPerformanceTimer::start()
+{
+    LARGE_INTEGER li;
+    QueryPerformanceCounter(&li);
+    t1 = li.QuadPart;
+}
+
+qint64 QPerformanceTimer::elapsed() const
+{
+    LARGE_INTEGER li;
+    QueryPerformanceCounter(&li);
+    return getTimeFromTick(li.QuadPart - t1);
+}
+
+////////////////////////////// Default //////////////////////////////
+#else
+
+// default implementation (no hi-perf timer) does nothing
+void QPerformanceTimer::start()
+{
+}
+
+qint64 QPerformanceTimer::elapsed() const
+{
+    return 0;
+}
+
+#endif
+
+QT_END_NAMESPACE
+
+