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diff --git a/src/corelib/global/qoperatingsystemversion_darwin.mm b/src/corelib/global/qoperatingsystemversion_darwin.mm
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qoperatingsystemversion_p.h"
+#import <Foundation/Foundation.h>
+
+#ifdef Q_OS_IOS
+#import <UIKit/UIKit.h>
+#endif
+
+QT_BEGIN_NAMESPACE
+
+typedef qint16 (*GestaltFunction)(quint32 selector, qint32 *response);
+
+QOperatingSystemVersion QOperatingSystemVersion::current()
+{
+    QOperatingSystemVersion v;
+    v.m_os = currentType();
+    v.m_major = -1;
+    v.m_minor = -1;
+    v.m_micro = -1;
+#if QT_MACOS_IOS_PLATFORM_SDK_EQUAL_OR_ABOVE(__MAC_10_10, __IPHONE_8_0) || defined(Q_OS_TVOS) || defined(Q_OS_WATCHOS)
+    if ([NSProcessInfo instancesRespondToSelector:@selector(operatingSystemVersion)]) {
+        NSOperatingSystemVersion osv = NSProcessInfo.processInfo.operatingSystemVersion;
+        v.m_major = osv.majorVersion;
+        v.m_minor = osv.minorVersion;
+        v.m_micro = osv.patchVersion;
+        return v;
+    }
+#endif
+    // Use temporary variables so we can return 0.0.0 (unknown version)
+    // in case of an error partway through determining the OS version
+    qint32 major = 0, minor = 0, patch = 0;
+#if QT_MACOS_IOS_DEPLOYMENT_TARGET_BELOW(__MAC_10_10, __IPHONE_8_0)
+#if defined(Q_OS_IOS)
+    @autoreleasepool {
+        NSArray *parts = [UIDevice.currentDevice.systemVersion componentsSeparatedByString:@"."];
+        major = parts.count > 0 ? [[parts objectAtIndex:0] intValue] : 0;
+        minor = parts.count > 1 ? [[parts objectAtIndex:1] intValue] : 0;
+        patch = parts.count > 2 ? [[parts objectAtIndex:2] intValue] : 0;
+    }
+#elif defined(Q_OS_MACOS)
+    static GestaltFunction pGestalt = 0;
+    if (!pGestalt) {
+        CFBundleRef b = CFBundleGetBundleWithIdentifier(CFSTR("com.apple.CoreServices"));
+        pGestalt = reinterpret_cast<GestaltFunction>(CFBundleGetFunctionPointerForName(b,
+                                                     CFSTR("Gestalt")));
+    }
+    if (!pGestalt)
+        return v;
+    if (pGestalt('sys1', &major) != 0)
+        return v;
+    if (pGestalt('sys2', &minor) != 0)
+        return v;
+    if (pGestalt('sys3', &patch) != 0)
+        return v;
+#endif
+#endif
+    v.m_major = major;
+    v.m_minor = minor;
+    v.m_micro = patch;
+    return v;
+}
+
+QT_END_NAMESPACE