问题
i'm trying to build an application that uses wxWidgets library. but i get a preprocessor error that says 'type_traits file not found'. i've followed the answers in the questions XCode 4.5 'tr1/type_traits' file not found and Xcode 4.3 and C++11 include paths but i'm still unable to resolve that error. how to configure xcode to include the type_traits file?
EDIT : i figured it out. libc++ needs deployment target >= OS X 10.7
来源：https://stackoverflow.com/questions/22855113/type-traits-file-not-found-xcode-5