gnome-scan-0.6.1 requires gegl-0.0.21. See here: http://svn.gnome.org/viewvc/gnome-scan/branches/GNOME_SCAN_0_6/configure.ac?r1=642&r2=641&pathrev=642 gnome-scan rpm is missing R/BR on this, causing "yum update gnome-scan" to not pull in appropriate gegl.
What version of gegl do you have on your rawhide installation?
rawhide has gegl-0.0.21, but I'm trying to pull in the rawhide gnome-scan to F9. I would think you would want to ensure the necessary gegl version in gnome-scan.