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diff --git a/thirdparty/linux/include/opencv2/flann/timer.h b/thirdparty/linux/include/opencv2/flann/timer.h
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+/***********************************************************************
+ * Software License Agreement (BSD License)
+ *
+ * Copyright 2008-2009  Marius Muja (mariusm@cs.ubc.ca). All rights reserved.
+ * Copyright 2008-2009  David G. Lowe (lowe@cs.ubc.ca). All rights reserved.
+ *
+ * THE BSD LICENSE
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *************************************************************************/
+
+#ifndef OPENCV_FLANN_TIMER_H
+#define OPENCV_FLANN_TIMER_H
+
+#include <time.h>
+#include "opencv2/core.hpp"
+#include "opencv2/core/utility.hpp"
+
+namespace cvflann
+{
+
+/**
+ * A start-stop timer class.
+ *
+ * Can be used to time portions of code.
+ */
+class StartStopTimer
+{
+    int64 startTime;
+
+public:
+    /**
+     * Value of the timer.
+     */
+    double value;
+
+
+    /**
+     * Constructor.
+     */
+    StartStopTimer()
+    {
+        reset();
+    }
+
+    /**
+     * Starts the timer.
+     */
+    void start()
+    {
+        startTime = cv::getTickCount();
+    }
+
+    /**
+     * Stops the timer and updates timer value.
+     */
+    void stop()
+    {
+        int64 stopTime = cv::getTickCount();
+        value += ( (double)stopTime - startTime) / cv::getTickFrequency();
+    }
+
+    /**
+     * Resets the timer value to 0.
+     */
+    void reset()
+    {
+        value = 0;
+    }
+
+};
+
+}
+
+#endif // FLANN_TIMER_H