xcode工程报错：opencv2/core/core.hpp file not found with include, use "quotes" instead

mac xcode工程，新增的opencv头文件报错： with <opencv2/core/core.hpp> file not found with <angled> include, use "quotes" instead.   解决方法：https://stackoverflow.com/questions/17465902/use-of-external-c-headers-in-ob

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