arch-ppa/src/webkitgtk/webkitgtk.install

post_install() {
  post_upgrade $1 0
}

post_upgrade() {
  if (( $(vercmp $2 2.4.11-4) < 0)); then
    cat <<END

  > WARNING: WebKitGTK+ 2.4 is known to have many security vulnerabilities that
             will NOT be fixed. Avoid browsing with it.

END
  fi
}