title: pecl install - how to specify options?
body: <p>I'm trying to install <code>event</code> extension for PHP using pecl. During the installation I get several prompts:</p>
  
  <pre><code>Enable internal debugging in Event [no] : 
  Enable sockets support in Event [yes] : 
  libevent installation prefix [/usr] : 
  Include libevent's pthreads library and enable thread safety support in Event [no] : 
  Include libevent protocol-specific functionality support including HTTP, DNS, and RPC [yes] : 
  Include libevent OpenSSL support [yes] : 
  PHP Namespace for all Event classes [no] : 
  openssl installation prefix [no] : 
  </code></pre>
  
  <p>But ofc that only happens in the interactive mode. I need to do this without interaction, for instance in Dockerfile. The default values don't work for me so I need to change them with command line options. How?</p>
  
  <p>Keep in mind that I need to answer differently for each question so <code>yes '' | pecl install ...</code> doesn't work at all. Also one of the questions needs a path and not yes/no.</p>