If I'm in Xcode 4 and set the compiler to use the C++11 standard libraries, I get a warning that my program will only work on OSX 10.7 and later. On OSX 10.6, I'm able to install GCC 4.8, via MacPorts, to get C++11 support, complete with its associated libstdc++. I can build such programs from a Makefile. But are such programs portable, or do they require MacPorts and GCC 4.8 installed on user's computers? I wonder if I can package libstdc++ (as installed by MacPorts) with my program, inside the app bundle. Any idea which file I should take? There are several libstdc++ dylib files in my /opt/local/lib folder, am I supposed to bundle one of them?