MacPorts

Don't use MacPorts. Use Fink.

MacPorts insists on installing every single dependency by hand, from source, completely ignoring any version that is on your system or on your $PATH. Usually these versions are more up-to-date, safer, and customized to work the way you want. But MacPorts doesn't care about that.

MacPorts also has many dependencies that will require certain versions of XCode that are no longer available for download or which require you to upgrade from OS X 10.5 to OS X 10.6 (Snow Leopard). Sorry, MacPorts, but it's not worth the money and hassle to upgrade my operating system (or, in some cases, buy a new computer) just so I can install zlib. I'll download the source and build it myself, thanks very much. OH WAIT, you won't be able to use the version that I download and build myself.