In OpenCV 2.4
<pre>

calcOpticalFlowPyrLK(opticalFlowTrackerImgOldGrayMat, opticalFlowTrackerImgGrayMat,
LKpoints[0], LKpoints[1], status, err, winSize, 3, termcrit, 0, LKSHIFT_TRACKER_ERROR_RATE );
</pre>

In OpenCV 2.3.1
<pre>

calcOpticalFlowPyrLK(opticalFlowTrackerImgOldGrayMat, opticalFlowTrackerImgGrayMat,
LKpoints[0], LKpoints[1], status, err, winSize, 3, termcrit, 0.5, 0, LKSHIFT_TRACKER_ERROR_RATE);
</pre>



Please add compatibility wrapper to prevent passing of incorrect params in older program code.

Cheers,
J