Install Full Text Search using Tsearch2
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Warning: tsearch has changed on postgresql 8.3, it may not work as expected.

1) Install postgresql-contrib package on postgresql server.
  
  # apt-get install postgresql-contrib

2) Load tsearch sql into dotlrn database (do it as a postgresql super-user).

  $ psql dotlrn < /usr/share/postgresql/8.x/contrib/tsearch2.sql

3) Read about how to enable it on dotlrn:

  http://openacs.org/doc/current/install-full-text-search-tsearch2.html