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It looks like your project is not linking against the C++ runtime library. To link against the runtime library:

• Go to the "Build Phases" tab of the project .
• Choose the "Link Binary With Libraries" section.
• Click the "+" button at the bottom of the section.
• From the list that appears, choose either "libc++.dylib" for OpenCV 2.4.3, or "libstdc++.dylib" for OpenCV 2.4.2 and before.

Rebuild, and everything should work.