post_install() {
  kbuildsycoca4 > /dev/null 2>&1
  cat << __EOF
    To migrate to version 2.* and newer see this article:
    http://arcanis.name/en/2014/09/04/migration-to-v2/
__EOF
}

post_upgrade() {
  post_install "$1"
}

post_remove() {
  post_install "$1"
}