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Please write in English, because the Emacs maintainers do not have
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In GNU Emacs 21.2.2 (sparc-sun-solaris2.6, OSF/Motif Version 1.2.6)
 of 2002-08-08 on athene
configured using `configure  --with-x-toolkit=motif --prefix=/usr/local/src/edcad/gnu'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: C
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

On reading (using C-x C-f) a file source controlled by SCCS and which has been
checked out from the command line, emacs gives the error

vc-sccs-state: Symbol's function definition is void: vc-workfile-unchanged-p

This does not occur either with GNU Emacs 20.2.1. In version 21.2, the error
does not occur if the variable vc-mistrust-permissions is set to t.

Attached is a tar file including a test case which shows the bug. This file
contains a directory called emacsbugshow, the subdirectory SCCS and its
associated files and a test file myfile.txt. To see the bug, start a new
vanilla emacs with emacs -q, and use C-x C-f to find myfile.txt.