I'm including <boost/format.hpp> and getting this error from Clang 3.4 on Ubuntu 12: In file included from /home/fe/frontend/Core/ThirdParty/boost/include/boost/format.hpp:38: In file included from /home/fe/frontend/Core/ThirdParty/boost/include/boost/format/internals.hpp:23: In file included from /home/fe/frontend/Core/ThirdParty/boost/include/boost/format/alt_sstream.hpp:21: In file included from /home/fe/frontend/Core/ThirdParty/boost/include/boost/shared_ptr.hpp:17: In file included from /home/fe/frontend/Core/ThirdParty/boost/include/boost/smart_ptr/shared_ptr.hpp:28: In file included from /home/fe/frontend/Core/ThirdParty/boost/include/boost/smart_ptr/detail/shared_count.hpp:30: /home/fe/frontend/Core/ThirdParty/boost/include/boost/smart_ptr/detail/sp_counted_impl.hpp:229:31: error: no type named 'allocator_traits' in namespace 'std' typedef typename std::allocator_traits<A>::template rebind_alloc< this_type > A2; ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~ Is this a bug or am I missing something? I'm using -std=C++11 flag.