Invalid version while creating PostgreSQL 9.1 cluster

Hello!
I'm trying create a cluster with existing data directory on Debian
2.6.26-2-686-bigmem. I use PostgreSQL 8.3 installed from apt-get and
PostgreSQL 9.1 installed from
[OpenSCG](http://www.openscg.org/se/oscg_download.jsp?file=packages/postgres-9.1.0-1.i386.openscg.deb&user=)
I want to create cluster with existing data directory and add it to
postgresql-commons using command:

pg_createcluster -d /opt/postgres/9.1/data/ -e UTF8 --locale ru_Ru
-p 6432 9.1 MAIN_RU

The result is:

Error: invalid version: 9.1

I found this question
http://serverfault.com/questions/288612/cant-create-clusters-in-postgresql-9-0
but it seems in my case the problem is in postresql-commons package or
in PostgreSQL 9.1 package that is installed.

aptitude show postgresql-common
Package: postgresql-common
New: yes
State: installed
Automatically installed: yes
Version: 94lenny1
Priority: optional
Section: misc
Maintainer: Martin Pitt <mpitt(at)debian(dot)org>
Uncompressed Size: 496k
Depends: postgresql-client-common (>= 94lenny1), procps, adduser,
debconf (>=
0.5.00) | debconf-2.0, lsb-base (>= 3.0-3)
Recommends: ssl-cert (>= 1.0.11)
Conflicts: postgresql (< 7.5), postgresql-7.4 (< 1:7.4.8-10),
postgresql-8.0 (<
8.0.3-7), postgresql-client (< 7.5)
Replaces: postgresql (< 7.5), postgresql-client (< 7.5)

Update.

I check this on Ubuntu 2.6.32-24-generic #39 with same deb packages, the
problem is the same. I think it's in postgresql-commons facilities
packaged in OpenSCG deb. PostgreSQL 9.1 is released 2011-09-11.

Any help would be appreciated.