Gimp can't install

I've been trying to open gimp on my MB Pro (has X11, got in August)... It keeps saying that the application suddenly closed and this is the report... How do I actually get it to open?

"Process: gimp-2.6 [4691]
Path: /tmp/skl/Gimp.app/Contents/Resources/bin/gimp-2.6
Identifier: gimp-2.6
Version: ??? (???)
Code Type: X86 (Native)
Parent Process: sh [4678]

Date/Time: 2009-01-07 19:14:25.047 -0500
OS Version: Mac OS X 10.5.6 (9G55)
Report Version: 6

Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Crashed Thread: 0

Dyld Error Message:
Library not loaded: /usr/X11/lib/libXdamage.1.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 3.0.0 or later, but libXdamage.1.dylib provides version 2.0.0
"

I think you may have an older version of X11. On the GIMP download page they give you a link to the most recent X11. I had the same error message but after upgrading my X11, it works just fine now.

Download

Where it says "GIMP on OS X now supports graphic tablets if you run Leopard. Please download and install the latest X11 provided by the Xquartz-Project, version 2.3.2 or later. "

Hope that helps

If you are fully updated to 10.5.6 you should already have the latest X11, but as the poster above says you need the download for Leopard / Intel.
When I upgraded from Tiger to Leopard I found the older version kept crashing and I had to re-download.

Cheers

Hugh