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| 3 | More and more C++ software is being written using the C++11 standard. The default C++ runtime on OS X 10.9 and later is libc++ which supports C++11 but on OS X 10.8 and earlier the default C++ runtime is a version of libstdc++ based on GCC 4.2.1 which does not support C++11. If you wish to build C++11-using software on 10.8 or earlier, you can switch MacPorts to use libc++ instead of libstdc++, but this must be done for MacPorts as a whole; it can't be done for individual ports. |
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| 5 | At this time the MacPorts project does not build binary packages for libc++ on systems older than 10.9, so if you make this change, MacPorts will be building all ports from source. |
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| 7 | If you use MacPorts C++-using ports as dependencies for C++-using software that you compile outside of MacPorts, you must compile that software using libc++ as well. |