post_install() {
  sed -i -re 's/^(hosts: .*files)(.*)$/\1 resolver\2/' /etc/nsswitch.conf
  mkdir -p /etc/resolver
}

post_remove() {
  rm -Rf /etc/resolver
  sed -i -re 's/^(hosts: .*files)\ resolver(.*)$/\1\2/' /etc/nsswitch.conf
}