[boost] [Beast] std::to_string not available in gcc 4.8?

A user is complaining that std::to_string is not available in their distribution. Beast doesn't support toolchains that don't have full support for C++11. However, if this is the only thing missing maybe I can just use a Boost equivalent to get him up and running. I see boost::to_string in is that a public interface? It doesn't look documented. What do folks typically do when they want to call std::to_string on an unsupported distribution?