InstallSynthAModeler
From CCRMA Wiki
Mac OS X
http://qt-project.org/downloads Then get "Qt libraries 4.8.4 for Mac (185 MB)" and install it (takes about 5 minutes excluding download time)
Then inside the Faust directory:
make
sudo make install
Linux
For beginners,
sudo apt-get update
sudo apt-get install libqt4-core qt4-qmake
For Ubuntu precise
For advanced users,
Download the Faust source for version 0.9.58