Homebrew/homebrew-science — pull request #206 by thegedge (2013-06-06 04:05:49+00:00)
Title: OpenCV 2.4.5: Disable OpenCL by default in pre-Lion.

OpenCL 1.1 is required for OpenCV 2.4.5+, but versions of OS X previous to Lion only come with OpenCL 1.0. Also, it is enabled by default, so switch to a --without-opencl option instead of a --with-opencl.