postgresql tablefunc library error

Hi,

We installed postgresql contrib package to make use of tablefunc library

However when we try to use it, it gives following error:

[pgadmins@dbserver ~]$ psql -U postgres someDBname
psql (9.1alpha1)
Type "help" for help.

halflines=# \i /usr/pgsql-9.1/share/contrib/tablefunc.sql
SET
psql:/usr/pgsql-9.1/share/contrib/tablefunc.sql:9: ERROR: could not load
library "/usr/pgsql-9.1/lib/tablefunc.so": /usr/pgsql-9.1/lib/tablefunc.so:
undefined symbol: quote_literal_cstr
....

More Info,

[root@dbserver ~]# uname -a
Linux dbserver.somename.tld 2.6.18-164.el5 #1 SMP Thu Sep 3 03:28:30 EDT
2009 x86_64 x86_64 x86_64 GNU/Linux

[root@dbserver ~]# cat /etc/redhat-release
CentOS release 5.4 (Final)

[root@dbserver ~]# rpm -qa | grep postgre
postgresql91-9.1-alpha1_2PGDG.rhel5
postgresql91-devel-9.1-alpha1_2PGDG.rhel5
postgresql91-contrib-9.1-alpha3_1PGDG.rhel5
postgresql-libs-8.1.11-1.el5_1.1
postgresql91-libs-9.1-alpha1_2PGDG.rhel5
postgresql91-server-9.1-alpha1_2PGDG.rhel5
postgresql91-debuginfo-9.1-alpha3_1PGDG.rhel5
[root@dbserver ~]#

Please advise how can we fix this.

Thanks