I'm using debian squeeze package, it says function does not exist?


You have to install the additional module fuzzystrmatch.
In PostgreSQL 9.1 or later you can simply use CREATE EXTENSION. Run once per database:

CREATE EXTENSION fuzzystrmatch;

In PostgreSQL 8.4 on Debian Squeeze, you would run (as user postgres) the SQL script provided by the package postgresql-contrib-8.4 (install that if you haven't already):

psql mydb -f /usr/share/postgresql/8.4/contrib/fuzzystrmatch.sql

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