"Aki" == Aki Vehtari <Aki.Vehtari(a)hut.fi&gt; writes 1998-12-09: Aki> Btw. gud.el in XEmacs is dated 1993 and gud.el in emacs-20.3 is Aki> dated 1998. Unfortunately gud.el in emacs-20.3 does not work in Aki> XEmacs and I don't know much work it would need to make it work and "SL" == SL Baur <steve(a)xemacs.org&gt; writes 1998-12-10: SL> I've done the initial port of gud.el to XEmacs. It mostly works[1], but SL> it sorely lacks the functionality in gdbsrc.el. Making a gudsrc.el SL> mode is on my list of things to do. ... SL> It was delayed integration into the XEmacs packages pending 21.0 SL> release. I have been using Steve's port of gud.el from Emacs distribution since 1998. I fixed one bug and added XEmacs/Emacs-compatibility and easymenu to it and sent it to xemacs-beta 1998-12-14. Today I noticed that gud.el in XEmacs distribution is still dated 1993 (with couple minor fixes mentioned in ChangeLog), so apparently neither Steve's port or my improvments to it never made it to distribution. gud.el in Emacs distribution and gud.el in XEmacs distribution differ in debugger-specific part of code quite much. Does anyone know is there big difference in functionality (i.e., is there any other reason than cautiousness to not update gud.el)? In gdbsrc.el there is following comment: ;;; gdbsrc.el -- Source-based (as opposed to comint-based) debugger ;; interaction mode eventually, this will be unified with GUD ;; (after gud works reliably w/ XEmacs...) Does that mean that current gud.el in XEmacs distribution does not work realiably w/ XEmacs? I have used Steve's port of gud.el from Emacs distribution because it is only one which works with matlab-shell-mode. Today I updated Steve's port with latest changes in latest Emacs distribution (20.7) and I can post it, if anyone is interested. I can also add to it those small changes made to gud.el in XEmacs distribution that are mentioned in ChangeLog. Aki