[ODE] drawstuff capture frames broken in Mac OS X x11?

[john rieffel]

Like Adam Dershowitz reported in august
(http://q12.org/pipermail/ode/2004-August/013822.html), I have not
been able to get captureFrame to work on my mac.

When I try to capture frames (i.e. via ctrl-w in the dropstuff demo),
all of the frames are blank.  Needless to say, it works fine on my
linux machine.

Has anyone else had this problem, or figured out how to resolve it?

Thanks,
John Rieffel