How to silently install SUNWsneep ?

Hello,
I'm trying to silently install SUNWsneep.
So I've tried to use pkgask to generate a response file and used pkgadd -n -r ... -d . SUNWsneep.
But it's still complaining:

# pkgadd -n -r /var/tmp/response -d . SUNWsneep

This package contains scripts which will be executed with super-user
permission during the process of installing this package.

Installation of <SUNWsneep> was suspended (interaction required).
No changes were made to the system.

Could you, please, let me know what else to try or where else to read how to do it?

Thanks in advance,
Carlos.