Problems run iOS

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Dear all,

I am trying to include opencv in my iOS existing project. Before to do that I tried to install opencv in a new iOS project (I followed the tutorial) and all is working fine. Then I tried to install opencv in my existing iOS project following all the instructions. I copied opencv lib, I modified pch files adding the ifdef command, I imported the iOS frameworks, I changed my iOS file from .m to .mm but I always had the following errors:

error core.hpp header must be compiled as C++ error base.hpp header must be compiled as C++ base.hpp:52:10: 'climits' file not found

I am trying to solve this problem since several days but I didn't found any solution. Please, help me!!!

Thank you in advance, Giordano