openCv & ios #include <ext/atomicity> error

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Hello !

I want to use OpenCV in a iOS project. With little project that's works good, but in another projet i have a problem in operations.hpp. The compilation log tells me there is an error in operations.hpp, that I don't know

 #include < ext / atomicity >

When i do a "locate" command i see it in the ios "normal" include folder.

i don't understand this error! Do you have suggestions ?

Léo

PS: i'm french, so sorry for my poor english, and can you respond without abbreviation =)