it's an option that you haven't specified in your config, so it's asking if you don't want it, or if you forgot.
Tell it if you want IANS support. yes, no, or module.
that's it.
If you don't know what IANS is, google for it, because I have no frikkin clue.
Unless you know you have an IANS device, I'd say "n".
--Rounan