[ioquake3] Mouse "limiting" problem under CentOS 5.3 - SDL bug?

[Nerius Landys]

I'm running the latest and greatest ioquake3 from SVN to run Urban
Terror on CentOS 5.3.  I am having a problem where my mouse movements
seem to be artificially limited.  For example, when I enter the game,
and I start moving the mouse to the right side, my player will rotate
right, and then will hit a "limit", after which any further movement
of the mouse to the right won't result in further player rotation.

I compiled ioquake3 from SVN (the latest) because I was getting the
same problem with ioUrbanTerror plain vanilla.  However, the latest
ioquake3 did not fix this problem.

When I compile either ioUrbanTerror or ioquake3 with SDL disabled, I
don't get this problem, which leads me to suspect that the problem is
somehow SDL-related.

CentOS seems like a fairly standard Linux distribution, so I'm sure
other people have run into this problem.  However, I do not endorse
CentOS.  Are there any good fixes for this?  I would like to keep SDL
enabled if possible.