I recently found out about the Darwin Ports. It is built on the BSD package management system and lets you easily install unix programs that have been ported to os x. The package management part of it handles the dependencies for you. You do need to install Xcode first though.
Once downloaded you need to add the darwin ports binaries folder to the search path. from the terminal run (or manually added the path to the .bashrc)
$echo 'export PATH=$PATH:/opt/local/bin' >> ~/.bashrc
$echo 'export PATH=$PATH:/opt/local/sbin' >> ~/.bashrc