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I'm trying to convert an image using this http://developer.apple.com/library/ios/#qa/qa1702/_index.html I don't know if it's because i'm using xcode4 or because some other issue. I'm trying to code for the IOS4. And can't compile it, because the linker complains the functions don't exist. But here they are in the documentation: http://developer.apple.com/library/ios/#documentation/QuartzCore/Reference/CVPixelBufferRef/Reference/reference.html#//apple_ref/doc/uid/TP40010033 Any help would be great Undefined symbols for architecture armv6: "_CVPixelBufferGetHeight", referenced from: -[CameraController imageFromSampleBuffer:] in CameraController.o "_CVPixelBufferGetBaseAddress", referenced from: -[CameraController imageFromSampleBuffer:] in CameraController.o "_CVPixelBufferGetWidth", referenced from: -[CameraController imageFromSampleBuffer:] in CameraController.o "_CMSampleBufferGetImageBuffer", referenced from: -[CameraController imageFromSampleBuffer:] in CameraController.o "_CVPixelBufferLockBaseAddress", referenced from: -[CameraController imageFromSampleBuffer:] in CameraController.o "_CVPixelBufferGetBytesPerRow", referenced from: -[CameraController imageFromSampleBuffer:] in CameraController.o "_CVPixelBufferUnlockBaseAddress", referenced from: -[CameraController imageFromSampleBuffer:] in CameraController.o ld: symbol(s) not found for architecture armv6 collect2: ld returned 1 exit status

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