post_upgrade() {
  if [ "$(vercmp $2 1.60-16)" -lt 0 ]; then
    echo "hostname and {,yp,nis}domainname has moved:"
    echo "----------"
    echo "hostname is now in coreutils"
    echo "domainname is now in yp-tools"
    echo "their functionality might have changed slightly"
    echo ""
    echo "dnsdomainname remains in net-tools"
    echo "----------"
  fi
}