Compilation Problem on OSX

I cann't compile Open frameworks with c++11. It works with c++98 but if I choose -std=c++11 and libc++ i become errors in relationship with the smart pointers (file types/ofTypes.h). The smart pointers are not located any more in . I'm new on OF, I have to work with c++11 because I have another Software (wrote in c++11 style) that I have to use in combination with OF. Could me please someone telll me how i should do, or how i have to modify the source?
I'm working on OSX.10 (Yosemite) with Xcode 6.4
Regards.
Luis