On 18 April 2011 17:29, doug livesey wrote: > Ah, no I didn't. Do you think I should recompile & reinstall with that enabled? Yes, I think that's necessary. You'll also want to rebuild Boost with the new compiler. > Also, are you able to tell me where how the system libraries are > compiled for Snow Leopard is documented, if they are? No, sorry, I only know about this particular issue as it's a fairly common gotcha: http://newartisans.com/2009/10/a-c-gotcha-on-snow-leopard/ https://trac.macports.org/ticket/22234 You could use 'g++ -v' on the default system compiler shipped with Xcode, but I don't know if that will show everything relevant. Changes such as enabling fully dynamic std::string might be made by changing the libstdc++ sources rather than via options to configure.