title: How can I install the postgresql-contrib module in an existing database?
body: <p>I'm using <code>postgresql 9.1.6</code> on CentOS. I would like to install the <a href="http://www.postgresql.org/docs/9.1/static/contrib.html" rel="nofollow">postgresql-contrib</a> module using a binary file, but I can't find it online. I'm unsure if I can install this after already installing <code>postgresql</code>. Is it possible to do this?</p>
  
  <p>I installed <code>postgresql</code> in the following way:</p>
  
  <pre><code>wget http://ftp.postgresql.org/pub/source/v9.1.6/postgresql-9.1.6.tar.gz
  tar -xzf postgresql-9.1.6.tar.gz 
  cd postgresql-9.1.6./configure --prefix=$HOME
  make 
  make install
  </code></pre>
  
  <p>I am currently using the databases within this install and would prefer not to reinstall it (if possible).</p>
  
  <p>I understand that once I install this I can use a function in the following way:</p>
  
  <pre><code>create extension tablefunc ;
  </code></pre>
  
  <p>EDIT: If I followed the instructions from <a href="http://www.postgresql.org/docs/9.1/static/contrib.html" rel="nofollow">here</a>, does  <code>gmake</code> and <code>gmake install</code> affect an existing database?</p>