Hi,

For the latest commits Structure Synth was not able to compile under GCC/Linux.
This have been fixed now.

Be aware that Structure Synth now requires the scripting module in Qt, meaning that the qmake call must be updated to something like:
/usr/local/Trolltech/Qt-4.4.0/bin/qmake -project -after "CONFIG+=opengl" -after "QT+=xml opengl script"

Regards, Mikael.