Mac OS X Tiger comes with Tk?

< ^ > P N |<>|^_>< --- | ~ ...Help

I thought it is said that Mac OS X Tiger comes with Tk?

when i do ruby

require 'tk'

it gives the following

dyld: NSLinkModule() error
dyld: Library not loaded: /usr/X11R6/lib/libX11.6.dylib
  Referenced from: /usr/lib/ruby/1.8/powerpc-darwin8.0/tcltklib.bundle
  Reason: image not found
Trace/BPT trap
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