title: PHP pcntl module install
body: <p>I'm about to start working with yii framework using composer and for that I need this php pcntl module working. As I read from the manuals it is not installed in ubuntu by default.
  Because of that I've found some instructions something like this</p>
  
  <pre><code>mkdir php
  cd php
  apt-get source php5
  cd php5-(WHATEVER_RELEASE)/ext/pcntl
  phpize
  ./configure
  make
  
  Then:
  cp modules/pcntl.so /usr/lib/php5/WHEVER_YOUR_SO_FILES_ARE/
  echo "extension=pcntl.so" &gt; /etc/php5/conf.d/pcntl.ini
  </code></pre>
  
  <p>and made installation.
  But know I'm getting message</p>
  
  <pre><code>PHP Warning:  Module 'pcntl' already loaded in Unknown on line 0
  </code></pre>
  
  <p>which probably means that maybe this module was already in my system.
  So what are my steps now ? Just pay no attention to this warning or I must do something to fix this problem ?</p>