Tsearch2 Spanish Dictionary

Hi All:

I have installed postgresql 8.3.1 on a Gentoo server, but i think that
the spanish dictionary isn't the correct because i have another two
machines with other postgresql versions and tserch2 installed, and a
simple test that i do is make a query with the spanish dictionary, i get
the follow results, the problem that i saw is in the accent, if i put a
word with accent doesn't work:

In postgresql-8.1.8:

SELECT to_tsvector('spanish','estadística');
to_tsvector
--------------
'estadist':1
(1 fila)

In postgresql-8.2.4:

SELECT to_tsvector('spanish','estadística');
to_tsvector
--------------
'estadist':1
(1 fila)

But in postgresql-8.3.1:

SELECT to_tsvector('spanish','estadística');
to_tsvector
-------------
'stic':2
(1 row)

whitout accent:

SELECT to_tsvector('spanish','estadistica');
to_tsvector
-------------
'estadist':2
(1 row)

what should i do to make it work well?

Thanks.

Mario Rdz.