I installed OpenCV 2.4.5 with OpenCL support from Macports, and Installation was successful.
When I tried to run the sample 'square', it failed with the following error:
OpenCV Error: Assertion failed (localThreads[0] * localThreads[1] * localThreads[2] <= kernelWorkGroupSize) in openCLVerifyKernel
I tried it on both CPU and GPU of my macbook pro retina 15 inch, but never succeed to run it. It seems that most of cv::ocl functions cause errors. Anybody could run the example, even on MS Windows ?