[extension]

"I just can't figure out how to get it windowed"

You tried the -windowed option?

I can't run it at all. It says "Missing required OpenGL extension".

[ableal]

The comments over at LWN may help: http://lwn.net/Articles/419828/ (maybe "the missing extension can be enabled with driconf" applies?)

[extension]

Yes, here is the bug report and work around, which worked for me:

http://bugzilla.icculus.org/show_bug.cgi?id=4825

[pmcginn]

thanks! I tried --window, -window, and -w before I gave up. Thank you!