title: How do I correctly install PHPUnit with PEAR?
body: <p>I have had to de- and reinstall a newer version of PHPUnit following <a href="https://stackoverflow.com/questions/9186000/call-to-undefined-method-php-codecoverage-filtergetinstance/9407628#9407628">these directions</a>. Now when I'm launching this line</p>
  
  <pre><code>sudo pear install --alldeps phpunit/PHPUnit
  </code></pre>
  
  <p>I see an error message, that looks like this.</p>
  
  <pre><code>Unknown remote channel: pear.symfony.com
  phpunit/PHPUnit requires package "channel://pear.symfony.com/Yaml" (version &gt;= 2.1.0)
  No valid packages found
  </code></pre>
  
  <p>If I install just Yaml by launching</p>
  
  <pre><code>sudo pear install symfony/YAML
  </code></pre>
  
  <p>an older version (1.0.6) will be installed that doesn't meet the dependency of PHPUnit. How can I possibly solve this?</p>