Unable to Uninstall X11SDK

I was trying to get GIMP to work on my new iMac G5 and I accidentally installed the X11SDK.pkg that comes on the hard drive already. It turns out that I needed to download the X11User file off of Apple's website to get GIMP to work on the Mac OS X. I've tried to find the X11SDK to remove it so I can install the user version but I can't find it.

Benjamin said:

the x11 sdk has really nothing to do with running x11, its just a software developer kit, just install x11 for osx. it should already be on your os x cd, either i think cd 3 of panther.. or part of the installer for tiger.. or.. http://www.apple.com/downloads/macosx/apple/x11formacosx.html

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I know it had nothing to do with running X11. I installed the SDK thinking it would allow me to run GIMP since it requires X11. Now I can't run GIMP and I can't install the User version of X11 since the SDK is installed.