Hi,

>>>>> In <m3y9atthj6.fsf@fermat.mts.jhu.edu>
>>>>>	Nevin Kapur <nevin@jhu.edu> wrote:

> Trying to access my IMAP server, Gnus failed with the following
> backtrace.  It looks like preview-latex defines set-buffer-multibyte
> in XEmacs and imap-disable-multibyte calls it resulting in the error.

> I'm not sure whose bug this is so I'm sending this to both lists.

> Signaling: (invalid-function (macro . #<compiled-function (multibyte)...
>   set-buffer-multibyte(nil)
>   imap-open("jesse.mts.jhu.edu" nil nil nil " *nnimap* jesse")
>   nnimap-open-connection("jesse")

The problem is that the macro `set-buffer-multibyte' is defined
at run-time, but it is not available at the Gnus compile-time.
IMHO, since the function `set-buffer-multibyte' is a Lisp
function in FSF Emacs, prv-xemacs.el should define it as also a
function, not a macro.  Here is a patch for imap.el: