Someone

is_installed() {
	for LOCATION in `cat /etc/ipkg.conf | grep "^dest\>" | cut -d ' ' -f 3`; do
		if [ $LOCATION = "/" ]; then
		        grep -q "^$1\$" /usr/lib/ipkg/status
		else
		        grep -q "^$1\$" $LOCATION/usr/lib/ipkg/status
		fi
	done
}