media-gfx/gnuplot has a local use flag xemacs, this flag is missing from use.local.desc and should be added. However, in looking at this it occurs to me that perhaps the ebuild could use just the global emacs use flag. I'm not familiar with gnuplot so I don't know if it really needs to depend on xemacs or not or if perhaps gnuplot could depend instead on virtual/emacs and just use the global emacs use flag.
Closing w/ xemacs (albeit now a dep to virtual/xemacs). It's installing lisp files, but w/o X of some sort it's not all that useful, so I'm leaving the local use flag as xemacs instead of emacs. Thanks!