sub-shell. If it is a function, this function will be called with the
face as the argument. If the @code{gnus-article-x-face-too-ugly} (which
is a regexp) matches the @code{From} header, the face will not be shown.
-The default action under Emacs is to fork off an @code{xv} to view the
-face; under XEmacs the default action is to display the face before the
+The default action under Emacs is to fork off the @code{display}
+program@footnote{@code{display} is from the ImageMagick package. For the
+@code{uncompface} and @code{icontopbm} programs look for a package
+like `compface' or `faces-xface' on a GNU/Linux system.}
+to view the face. Under XEmacs or Emacs 21+ with suitable image
+support, the default action is to display the face before the
@code{From} header. (It's nicer if XEmacs has been compiled with X-Face
support---that will make display somewhat faster. If there's no native
X-Face support, Gnus will try to convert the @code{X-Face} header using
-external programs from the @code{pbmplus} package and friends.) If you
+external programs from the @code{pbmplus} package and
+friends.@footnote{On a GNU/Linux system look for packages with names
+like @code{netpbm} or @code{libgr-progs}.}) If you
want to have this function in the display hook, it should probably come
last.