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My .pch:

#import <opencv2/opencv.hpp>

#import <Availability.h>

#ifndef __IPHONE_5_0
#warning "This project uses features only available in iOS SDK 5.0 and later."
#endif

#ifdef __OBJC__
    #import <UIKit/UIKit.h>
    #import <Foundation/Foundation.h>
#endif

You should try to include OpenCV framework before any definitions on your .pch file.