Gimp startup problems

I've looked on the web to no avail. I was hoping for some insight into a problem with gimp and X11. I recently upgraded from 10.4 to 10.5 and have broke my gimp installation. I get the following message when I try to start gimp:

dyld: Library not loaded: /usr/X11/lib/libXrandr.2.dylib
Referenced from: /tmp/skl/Gimp.app/Contents/Resources/lib/libgtk-x11-2.0.0.dylib
Reason: Incompatible library version: libgtk-x11-2.0.0.dylib requires version 4.0.0 or later, but libXrandr.2.dylib provides version 3.0.0
/tmp/skl/Gimp.app/Contents/Resources/bin/gimp: line 7: 572 Trace/BPT trap dbus-launch gimp-2.4 "$@"

It looks like I need a newer version of libXrandr.2.dylib. I have looked online but cannot determine how that is accomplished.

Any help would be greatly appreciated.
Daniel

PS. I have the latest X11 and have run all software updates. It is on an Intel based MBP.

Just download the appropriate Gimp build from Wilbur-loves-apple

I did that. I guess I should have told you that gimp is at version 2.4.5 and X11 is at version 2.1.1.

did you reinstall (or install) the 10.5.2 combo-update for leopard?

http://darwingimp.sourceforge.net/download.html

Can't install combo update?

I tried that, but when I opened the installer package, it said, "This system does not need this update." I couldn't click continue or next or anything, except cancel. Although, I did do the Software Update version before. Please help. In the mean time, I'm downloading the Tiger version of Gimp to see if that gets me anywhere.