comint calls buffer-local-value

`comint.el' revisions 1.14 through 1.19 call `buffer-local-value' function that does not exist in 21.4. It is signalled like this. Lisp error: (void-function buffer-local-value) buffer-local-value(comint-displayed-dynamic-completions #<buffer "*Completions*">) comint-dynamic-list-completions(("extw-Xt.c" "extw-Xt.h")) comint-dynamic-list-filename-completions() comint-dynamic-complete-as-filename() comint-dynamic-complete-filename() run-hook-with-args-until-success(comint-dynamic-complete-filename) #<compiled-function nil "...(4)" [run-hook-with-args-until-success comint-dynamic-complete-functions] 2 ("/home/gin/xemacs-21.4-l/xemacs-packages/lisp/xemacs-base/comint.elc" . 74357) nil>() call-interactively(comint-dynamic-complete) `buffer-local-value' appeared in 21.5 only on 2002/06/26 00:11:16 -0. Is it better to change `comint.el', to backport `buffer-local-value' addition to 21.4, or to do something else, have no considerations to date.