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Download a stable version 2.4 of opencv, and follow the steps in this blog. All is fine

For some notes:

I have encountered the same issue. There is no good solution existing in web. So, I try by my own.

This article give me key idea. The folder 'ocl' in modules is needed but missing. Maybe it is a bug in 3.0 beta, or there are some build tips needed but I can not find. Anyway, I download a stable version 2.4 of opencv. Then, CMake to conigure, generate, then make. It works.