title: Install PL/Perl in PostgreSQL
body: <p>I using PostgreSQL and I want to create a function in pl/perl, but the PostgreSQL doesn't contain pl/perl.</p>
  
  <p>When I type <code>createlang plperlu databasename</code> it shows:</p>
  
  <blockquote>
    <p>createlang: language installation failed: ERROR : could not open
    extension control file
    "/usr/local/pgsql/share/extension/plperlu.control": No such file or
    directory</p>
  </blockquote>
  
  <p>How can I install plperlu?</p>
  
  <p>The PostgreSQL version is 9.1 in CentOS 5.8</p>