title: How to enable PCNTL on Ubuntu server 16.04
body: <p>I'm wondering how to enable pcntl extension in PHP7 running on Ubuntu server 16.04.<br>
  I saw this <a href="http://www.crimulus.com/2010/07/30/howto-enable-pcntl-in-ubuntu-php-installations/" rel="noreferrer">http://www.crimulus.com/2010/07/30/howto-enable-pcntl-in-ubuntu-php-installations/</a> but do we really have to recompile PHP7?   </p>
  
  <p>It surprises me as other extensions are usually simple to add with apt-get.</p>
  
  <p>Thanks</p>