The command wget is useful, but unfortunately doesn't come preinstalled with Mac. Yeah, you can install it of course, but if you're doing it from source, the process has a few steps to satisfy all the dependencies; start by configure make'ing the wget source and work your was backwards until ./configure runs for your wget source without hiccups.
This is how to get a poor mans wget, or simply realize that you can use curl -O, unless you're getting content via https.
alias wget="curl -O" |