POSTIN

/bin/sh

if [ -x /usr/bin/update-menus ]; then /usr/bin/update-menus || true ; fi 

update-alternatives --install /usr/bin/xmess xmess /usr/X11R6/bin/xmess.SDL     10
# without the following, the group stays in default manual mode,
#  and no link is created
[ -e /usr/bin/xmess ] || update-alternatives --auto xmess

POSTUN

/bin/sh

if [ "$1" = "0" -a -x /usr/bin/update-menus ]; then /usr/bin/update-menus || true ; fi 

if [ "$1" = 0 ]; then
  # Remove update-alternatives entries
  update-alternatives --remove xmess /usr/X11R6/bin/xmess.SDL
  update-alternatives --auto xmess
fi