Migration is still required to reinstall ports as the underlying system libraries change on a major version upgrade of Mac OS X. However, situation still impro

Migration is still required to reinstall ports as the underlying system libraries change on a major version upgrade of Mac OS X. However, situation still improved a lot since then. If the licensing of the port and all dependencies allow it, MacPorts now even offers pre-compiled binary archives for Snow Leopard, Lion and Mountain Lion. Often you do not even have to compile software yourself anymore.