The examples with a call to gui() in setup() segfaults on ubuntu 14.04 with nvidia-346 driver. I have debugged it down to the 3rd call to OnDraw() in gfx_control.h.
Tested with xFabrikChain.cpp
Seems like a problem with mWindowEventHandlers
The examples compile and run when the call to gui is commented out. Examples in glv also compiles and run.