https://bugs.freedesktop.org/show_bug.cgi?id=31499
--- Comment #3 from Tom Stellard tstellar@gmail.com 2010-11-19 17:46:59 PST --- The Lanczos filter fragment shader uses indirect addressing and support for this was recently added to git about a week ago, can you try again with a more up to date version of libgl1-mesa-dri?