I have xscreensaver-3.24-1 and Mesa-3.2-2 installed. When I try to upgrade to the XFree86 4.0 Rawhide packages, I get: error: failed dependencies: libGLU.so.1 is needed by xscreensaver-3.24-1 I don't quite understand this, since Mesa provides thelibGLU.so.1 that xscreensaver wants, and I'm not upgrading Mesa, so that library should remain after the XFree86 4.0 upgrade. Unlexx the new XFree86 RPM are somehow configured to supersede the Mesa RPM or something. In short, either XFree86 or xscreensaver has a problem which prevents both of them from being upgraded together from Rawhide.
Mesa is included with XFree86 4.0 in the XFree86-libs-4.0-0.8.i386.rpm package including libGLU.so.1 so remove your Mesa package and install the XFree86-libs and XFree86 stuff then install xscreensaver. Upgrade any packages which claim to depend on Mesa if they are vital, but it would probably be safe to uninstall Mesa with --nodeps after trying it without the flag to see what needs it. Hope that helped, -Stan Bubrouski
Mesa is a separate package again now, as of the 0.20+ XFree86-4.0 RPMs.