Darryl> http://www.xemacs.org/list-archives/xemacs-beta/9809/msg00431.html Hello Darryl, please send patches to xemacs-patches, otherwise they may never make it into XEmacs. It seems we were lucky this time. Also, I switched over from diff -c to diff -u a while back, when I was convinced by more experienced XEmacs hackers that it makes smaller and better readable patches. Sun's diff does not support -u, but GNU diff does. Hence I've (custom-set-variables <lines deleted by Adrian> '(ediff-custom-diff-program "/opt/gnu/bin/diff") <lines deleted by Adrian> '(ediff-custom-diff-options "-u") <lines deleted by Adrian> '(vc-diff-switches nil t) <lines deleted by Adrian> '(ediff-diff-program "/opt/gnu/bin/diff") <lines deleted by Adrian> '(cvs-diff-program "/opt/gnu/bin/diff" t) <lines deleted by Adrian> '(emerge-diff-program "/opt/gnu/bin/diff" t) <lines deleted by Adrian>) in my .emacs <HINT to Mike Sperber> AFAIK, dired does not allow for customization of it's diff program. </HINT to Mike Sperber> I almost always use cvs diff (C-x v =) on files (or even directories!). To diff sources not under CVS, I use ediff. HTH, Adrian -- Adrian Aichner Applications Engineer Teradyne GmbH Semiconductor Test Group Telephone +49/89/41861(0)-208 Dingolfinger Strasse 2 Fax +49/89/41861-217 D-81673 MUENCHEN E-mail aichner(a)ecf.teradyne.com