All platforms
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Download Qt for your OS (http://qt-project.org/downloads) and select Qt 4.8.x for better performances & compatibility.

Linux, Mac OS X & Linux
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Open the project (.PRO) then build !
Mac OS X users: download Syphon framework if you want Syphon features!

Linux (if missing libraries)
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chmod u+x <name of Qt package>
./<name of Qt package>
sudo apt-get install g++
sudo apt-get install libfreetype6-dev
sudo apt-get install libglib2.0-dev
sudo apt-get install libsm-dev
sudo apt-get install libxrender-dev
sudo apt-get install mesa-common-dev
sudo apt-get install libglu1-mesa-dev
sudo apt-get install libasound2-dev
sudo apt-get install gtk2-engines-pixbuf

If opengl is slow, check Graphical Card drivers.