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diff --git a/qmake/cachekeys.h b/qmake/cachekeys.h
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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 qmake application of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, 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.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef CACHEKEYS_H
+#define CACHEKEYS_H
+
+#include "project.h"
+#include <qstring.h>
+#include <qstringlist.h>
+#include <qfile.h>
+#include <qfileinfo.h>
+#include <qhash.h>
+
+QT_BEGIN_NAMESPACE
+
+// -------------------------------------------------------------------------------------------------
+struct FixStringCacheKey
+{
+    mutable uint hash;
+    QString string, pwd;
+    uchar flags;
+    FixStringCacheKey(const QString &s, uchar f)
+    {
+        hash = 0;
+        pwd = qmake_getpwd();
+        string = s;
+        flags = f;
+    }
+    bool operator==(const FixStringCacheKey &f) const
+    {
+        return (hashCode() == f.hashCode() &&
+                f.flags == flags &&
+                f.string == string &&
+                f.pwd == pwd);
+    }
+    inline uint hashCode() const {
+        if(!hash)
+            hash = qHash(string) | qHash(flags) /*| qHash(pwd)*/;
+        return hash;
+    }
+};
+inline uint qHash(const FixStringCacheKey &f) { return f.hashCode(); }
+
+// -------------------------------------------------------------------------------------------------
+struct FileInfoCacheKey
+{
+    mutable uint hash;
+    QString file, pwd;
+    FileInfoCacheKey(const QString &f)
+    {
+        hash = 0;
+        if(isRelativePath(f))
+            pwd = qmake_getpwd();
+        file = f;
+    }
+    bool operator==(const FileInfoCacheKey &f) const
+    {
+        return (hashCode() == f.hashCode() && f.file == file &&
+                f.pwd == pwd);
+    }
+    inline uint hashCode() const {
+        if(!hash)
+            hash = qHash(file) /*| qHash(pwd)*/;
+        return hash;
+    }
+    inline bool isRelativePath(const QString &file) {
+        int length = file.length();
+        if (!length)
+            return true;
+
+        const QChar c0 = file.at(0);
+        const QChar c1 = length >= 2 ? file.at(1) : QChar(0);
+        return !(c0 == QLatin1Char('/')
+                || c0 == QLatin1Char('\\')
+                || (c0.isLetter() && c1 == QLatin1Char(':'))
+                || (c0 == QLatin1Char('/') && c1 == QLatin1Char('/'))
+                || (c0 == QLatin1Char('\\') && c1 == QLatin1Char('\\')));
+    }
+};
+inline uint qHash(const FileInfoCacheKey &f) { return f.hashCode(); }
+
+// -------------------------------------------------------------------------------------------------
+template <typename T>
+inline void qmakeDeleteCacheClear(void *i) { delete reinterpret_cast<T*>(i); }
+
+inline void qmakeFreeCacheClear(void *i) { free(i); }
+
+typedef void (*qmakeCacheClearFunc)(void *);
+void qmakeAddCacheClear(qmakeCacheClearFunc func, void **);
+void qmakeClearCaches();
+
+QT_END_NAMESPACE
+
+#endif // CACHEKEYS_H