supporting older versions of emacs (was: Re: bootstrap fails AND how about fixing the byte-compiler?)

[Dan Nicolaescu]

Alan Mackenzie <address@hidden> writes:

  > Anyhow, it seems the best solution for cc-vars.el right now (after all,
  > it's got to work with Emacs 2[01] and various flavours of XEmacs, too),
  > is to change c-constant-symbol into a macro.  

It's obviously your choice, but is it worth it to still support
emacs-20? 
21.1 was released in October 2001. 
Is the number of people that do not upgrade to emacs-21, but still want
to use the latest cc-mode significant enough to be worth the trouble?