Someone

darwich@darwich:~$ DISPLAY=:1 beryl & sleep 5 && killall beryl && metacity
[1] 10275
**************************************************************
* Beryl system compatiblity check                            *
**************************************************************

Detected xserver                                : XGL

Checking Display :1 ...

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

beryl: GLX_EXT_texture_from_pixmap is missing
beryl: Using non-tfp mode
beryl: GLX_SGIX_fbconfig is missing
beryl: Failed to manage screen: 0
beryl: No manageable screens found on display :1