http://www.macports.org/
Install gnutar
sudo port install gnutar
Install gsed
sudo port install gsed
Replace tar and sed in Mac OS X
sudo mv /usr/bin/tar /usr/bin/darwintar
sudo ln -s /opt/local/bin/gnutar /usr/bin/tar
sudo mv /usr/bin/sed /usr/bin/darwinsed
sudo ln -s /opt/local/bin/gsed /usr/bin/sed
or you can build from source
http://prep.ai.mit.edu/pub/gnu/tar/tar-latest.tar.gz
http://prep.ai.mit.edu/pub/gnu/sed/sed-4.2.tar.gz
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