使用libstdc++编译库使用clang+ -stdlib=libc+

I am working in C++ under Mac OS X (10.8.2) and I recently came up with the need of using C++11 features, which are available through the clang++ compiler using the libc++ stdlib. However, I also need to use some legacy library compiled and linked against libstdc++ (coming from MacPorts). I am working in C++ under Mac OS X (10.8.2) and