Either installing the X11 package (X11User.pkg) from your OS X dvd or from the Apple download should suffice. Is there an X11(.app) in your /Applications/Utilities folder?
If X11 is in your /Applications/Utilities folder and a fresh launch of the OOo installer still complains, I'm rather baffled.
If you'd rather not mess with X11 at all, though, you should check out NeoOffice/J (see elsewhere in these fora and the website link on the left sidebar), which eliminates the need for X11 and has better OS integration to boot.
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