<chapter id="contrib">
 <title>Standard Modules</title>

 <para>
  This section contains information regarding the standard modules which
  can be found in the <literal>contrib</literal> directory of the
  PostgreSQL distribution. These are porting tools, analysis utilities,
  and plug-in features that are not part of the core PostgreSQL system,
  mainly because they address a limited audience or are too experimental
  to be part of the main source tree.  This does not preclude their
  usefulness.
 </para>

 <para>
  Some modules supply new user-defined functions, operators, or types.  In 
  these cases, you will need to run <literal>make</literal> and <literal>make
  install</literal> in <literal>contrib/module</literal>. After you have 
  installed the files you need to register the new entities in the database 
  system by running the commands in the supplied .sql file.  For example,

  <programlisting>
   $ psql -d dbname -f module.sql
  </programlisting>
 </para>

 &adminpack;
 &btree-gist;
 &chkpass;
 &cube;
 &dblink;
 &earthdistance;
 &fuzzystrmatch;
 &hstore;
 &intagg;
 &intarray;
 &isn;
 &lo;
 &ltree;
 &oid2name;
 &pageinspect;
 &pgbench;
 &buffercache;
 &pgcrypto;
 &freespacemap;
 &pgrowlocks;
 &standby;
 &pgstattuple;
 &trgm;
 &seg;
 &sslinfo;
 &tablefunc;
 &uuid-ossp;
 &vacuumlo;
 &xml2;
</chapter>

