font-lock-add-keywords substitute in XEmacs?

Hello XEmacs developers, First, let me apologise if this is the wrong list. I couldn't find a user's list on http://www.xemacs.org/Lists/index.html I have a minor mode that needs to add font-lock highlighting keywords while the mode is in effect. In Emacs, I use the command font-lock-add-keywords to add keywords for the curren buffer, but it is not available on XEmacs 21.4. Is there a method to do this in XEmacs? I have tried the following: (put 'debian-bug-minor-mode 'font-lock-defaults '(debian-bug-font-lock-keywords)) but it didn't change anything in the appearance of the buffer. I'd be interested to know if I'm doing anything wrong. I'm not subscribed to the list, so please CC replies to me. Thanks, -- Peter Galbraith