Andy Piper <andy(a)xemacs.org&gt; writes: Hm. M-x customize RET gut TAB "gutter" TAB "[Sole completion]" RET There's only one entry in this customize buffer, a group named "Buffers Tab". Fine, I open it...which contains no items related to visibility. I can't customize gutter-visible-p if I can't even find it. Well, I just peeked in gutter-items.el directly, and found that it's in group 'display. While true, it's a long way from intuitive. I expect to find gutter things in the gutter group. This is possibly customize's biggest failing: There's approximately 18 bazillion things one might wish to customize. Not a one of them is accessible without either knowing /a priori/ the navigation route to find the items in question, or peeking in *.el files to find the items and discover their groups as defcustom'd. Perhaps significantly, even M-x hyper-apropos on gutter-visible-p doesn't show the customize group.