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If you're using OpenCV 2.4.2 or earlier, you need to add libstdc++ to your project. To do this:

• Click on the project in the Project Navigator.
• Select the "Build Phases" tab.
• In the "Link Binary with Libraries" section, click the "+" button.
• Add "libstdc++.dylib" from the list that appears.
• Rebuild.

If you're using OpenCV 2.4.3 or later, you need to do the same thing, but with libc++.dylib.