I built Quackle 0.94 without any problems on my Linux machine (Fedora Core 4, x86_64), but the display is jittery. The main window is fine, but when I start a new game, the board, the rack, and the "Set rack" and "Shuffle" buttons continuously change size or position so that you're unable to read them.
This did not happen in Quackle 0.93.