How can I get qmake on Mac OS X?

Homebrew version

$ brew install qt

Just to elaborate for anyone who finds that after installing qt5, can't access qmake in the terminal.

Install QT5 using:

brew install qt5

Then to allow access qmake from the terminal you'll need to run:

brew link qt5 --force

Just got it!

1. Install MacPorts: http://www.macports.org/

2. On Terminal: sudo port install qt4-mac

Then, I got qmake. You can install qtiplot directly by running: sudo port install qtiplot. Process takes about 3h.