Paul> Perhaps you can explain it to us? :-) More seriously: does an Paul> explanation belong in the Autoconf manual somewhere? Nope, it's just a plain XEmacs bugs. Well, actually, after some fight I found a relevant comment: etags.el: ;; #### Should make it work with the `include' directive! (defun add-to-tag-completion-table () tags work fine with XEmacs as long as you don't use the completion of tag names :( It's like this since years... Paul> I don't often use XEmacs, so I hope it works with GNU Emacs. I know :) Paul> I'm afraid you'll have to spell out the character ranges, e.g.: Paul> ETAGS_SH = --lang=none Paul> --regex='/\([abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_][abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_0123456789]*\)=/\1/' Paul> \ Paul> as 'a-z' isn't portable outside the C locale and (as far as I Paul> can see) there's no guarantee that the regex is interpreted in Paul> the C locale. Arrg. I forgot. Thanks <g> :) Paul> Other than that, the change looks good if it works for you. It does. Thanks for the other reports too!