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I am pretty certain that I too had this issue last week. I was building 2.4.9 from source with gcc4.8 (via homebrew). I am fairly certain I had the same errors, or at least that they pertained to highgui.

I finally got everything working by downgrading to brew's version OpenCV 2.4.8, and CMake 2.8.11.2. (I have no idea if your explicitly after 2.4.9, or (as in my case) just trying to get OpenCV installed in general.)

I would try downgrading CMake first, and then the older version of OpenCV. I never attempted the 2.4.9 build with downgraded CMake though. The hint to downgrade CMake was found when googling a run-time issue with the highgui.dylib: Stack Overflow link

I am pretty certain that I too had this issue last week. I was building 2.4.9 from source with gcc4.8 (via homebrew). I am fairly certain I had the same errors, or at least that they pertained to highgui.

I finally got everything working by downgrading to brew's version of OpenCV 2.4.8, and CMake 2.8.11.2. (I have no idea if your you are explicitly after 2.4.9, or (as in my case) just trying to get OpenCV installed in general.)

I would try downgrading CMake first, and then the older version of OpenCV. I never attempted the 2.4.9 build with downgraded CMake though. The hint to downgrade CMake was found when googling a run-time issue with the highgui.dylib: Stack Overflow link