--> beryl --test-only [output] <--

**************************************************************
* Beryl system compatibility check                           *
**************************************************************

Detected xserver                                : AIGLX

Checking Display :0 ...

Checking for XComposite extension               : passed (v0.3)
Checking for XDamage extension                  : passed
Checking for RandR extension                    : passed
Checking for XSync extension                    : passed

Checking Screen 0 ...

libGL warning: 3D driver claims to not support visual 0x4b
Root visual is not a double buffered GL visual