Xorg fails to start on x86-64 rawhide

[Jonathan Corbet]

FYI, I just decided to see what this post-FC5 rawhide thing was about.
My reward was a black screen - not quite what I'd had in mind.  In the
end, the key thing seems to be this line from the Xorg output:

    X: symbol lookup error: /usr/lib64/xorg/modules/extensions/libglx.so: undefined
			    symbol: DRIQueryDirectRenderingCapable

Commenting the 'Load "glx"' line in xorg.conf got me a working system
again.  This is with xorg-x11-server-Xorg-1.0.99.1-2.

jon