XCode - #include in ml.hpp : No such file or directory

Question

I\'m trying to compile a C++ code (OpenCV) and I\'m going to the end. I just have a few \"No such file or directory\" compile error into XCode 4 on those lines :

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Answer 1

I've just included into one of my .m files, exactly like the example project.

If you want to use C++ classes, you must use Objective-C++. Your source files (not your header files, mind - the source files that #include them) must have a .mm extension.