infodir=usr/share/info

post_upgrade() {
  [ -x usr/bin/install-info ] || return 0
  install-info $infodir/DevIL_manual.info.gz $infodir/dir 2> /dev/null
}

pre_remove() {
  [ -x usr/bin/install-info ] || return 0
  install-info --delete $infodir/DevIL_manual.info.gz $infodir/dir 2> /dev/null
}