I just compiled XORG 7.1 and FBSD 7.0 without xcb. The result is glxgears and glxinfo run well and give me the expected output. glxgears run at 500 FPS and glxinfo give me direct rendering: Yes. Previusly with xcb compiled in those 2 apps doesn't work at all and say that thereis some problem with pthread. What might be wrong with it ?