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FreeBSD ships with GCC 4.2.1 as the system compiler because it was the last release to be GPLv2 and GPLv3 stuff is not allowed in the base system. GCC 4.4 is in ports, and you can use this to compile ports easily by just setting a flag in make.conf if you care. FreeBSD 9 will hopefully be using LLVM/Clang as the system compiler, which should give it a nice boost.
