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Okay first of all some remarks

1. Official openCV 2.4 branch, which is the 2.4.9 branch with extra fixes, has no haarfinder folder nor has it the mergevec folder.
2. Neither does the master branch.

Nevertheless people have been asking around for the mergevec software lately. Let me repeat that mergevec is NOT an official supported piece of code, but simply the work of someone programming with openCV who has stopped supporting the mergevec utility.

The mergevec utility isn't needed in any way to train a cascade classifier.