Hello, 

I tried to run the slonik config script for the pgbench database example in:
 http://gborg.postgresql.org/project/slony1/genpage.php?howto_basic

however, when i run it, i get the following error:

<stdin>:21: PGRES_FATAL_ERROR load '$libdir/xxid';  - ERROR:  could not access f
ile "$libdir/xxid": No such file or directory
<stdin>:21: Error: the extension for the xxid data type cannot be loaded in data
base 'dbname=pgbench host=localhost user=pgsql'


please let me know what i'm missing.  
thank you, amir