Beryl/Compiz on ati rage 128

[Quant]

Hi, I'm tryng to install beryl/compiz on an old ati rage128.
I have xgl and 3d acceleration enabled  and working correctly, but when I
try to start compiz or beryl I get a "visual is not a double buffered
gl visual" error message.

According to this link:
http://lists.freedesktop.org/archives/xorg/2007-January/020919.html ,
I have to replace "for (db = 0; db <= R128_USE_DB; db++) {" line in
r128_dri.c, but this line does not exist in my driver.

Any suggestion?

KKnull.
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