compose key on SUN keyboard does not work anymore

[Klaus Zeitler]

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In GNU Emacs 21.3.1 (sparc-sun-solaris2.8, Motif Version 2.1.0)
 of 2003-04-07 on sfsws4
configured using `configure  --with-gcc 
--prefix=/vol/freeware/SunOS-5.8/emacs/21.3 
--sharedstatedir=/vol/freeware/SunOS-5.8/emacs/21.3/share 
--with-x-toolkit=motif --x-includes=/usr/openwin/include:/usr/local/gnu/include 
--x-libraries=/usr/openwin/lib:/usr/local/gnu/lib --with-pop'
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:

When I press the "compose" key on my SUN keyboard, emacs 21.3 beeps.
C-h k returns: <space> is undefined, i.e. emacs thinks this key is
defined as <space>.

xmodmap/xkeycaps tell me about this key:
KeyCode: Compose 0x4A 74 0112
KeySym: Multi_key

This key works fine in emacs 21.2, i.e. emacs allows me to use the key
to enter 2-key combinations like e.g. "a" followed by an apostrophe.

Recent input:
C-h k <space> <help-echo> <help-echo> <menu-bar> <help-menu> 
<report-emacs-bug>

Recent messages:
(./emacs -q --no-site-file)
Loading disp-table...done
Loading tool-bar...done
Loading image...done
Loading tooltip...done
For information about the GNU Project and its goals, type C-h C-p.
<space> is undefined
Loading emacsbug...done