diff-apply-hunk uses smerge-refine-subst which is not defined

[Sam Steingold]

GNU Emacs 23.0.50.22 (x86_64-unknown-linux-gnu, GTK+ Version 2.8.20)
 of 2007-10-25 on nyc-qws-005
 '-with-gtk' '-with-gif=no'

Debugger entered--Lisp error: (void-function smerge-refine-subst)
  smerge-refine-subst(1354 1781 1781 1884 ((diff-mode . fine) (face 
diff-refine-change)) diff-refine-preproc)
  diff-refine-hunk()
  #[nil "À ‡" [diff-refine-hunk] 1]()
  diff-hunk-next()
  diff-apply-hunk(nil)
  call-interactively(diff-apply-hunk)

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Sam Steingold (http://sds.podval.org/) on Fedora Core release 5 (Bordeaux)
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