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Character not found: _objc_retainAutoreleasedReturnValue

I previously managed to run my code on an iOS 4.3 device, but now I get this error at runtime:

 Symbol not found: _objc_retainAutoreleasedReturnValue

The project uses basic sdk 6.0 and a deployment target of 4.0.

This may not be a coincidence, but this is the first time I have tried to run this device since it was upgraded to Xcode 4.5.

I looked at stackoverflow in previous questions containing _objc_retainAutoreleasedReturnValue, but they seem to mention @autoreleasepool, which I am not using explicitly anywhere.

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Verify that the libraries you include are built with the same deployment requirements as your main project.

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