"std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::str() const"

"std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::str() const"

ymbol(s) not found for architecture x86_64

解决方案：

Change the standard library that is linked to use libstdc++ instead of libc++ - the problem is that the other library was compiled using the g++ mode which uses the libstdc++ library.