debconf causes hang

[Iain]

Hi,

I am having a problem using debconf in my postinst:

#! /bin/sh

set -e
. /usr/share/debconf/confmodule

case "$1" in
    configure)
        db_get qmail-scanner/admin
        ADMIN="$RET"
        db_get qmail-scanner/domain
        DOMAIN="$RET"
        db_get qmail-scanner/notify
        NOTIFY="$RET"
        db_stop

        cd /usr/lib/qmail-scanner/
        ./configure --admin $ADMIN --domain $DOMAIN --bindir /usr/sbin --notify 
$NOTIFY --install

The problem is that when it gets to the above configure line (which expects 
user input), it just hangs whereas
if I run it from the command line it works fine.

Am i doing something wrong?

thanks, Iain.