title: Install oAuth PECL error: Cannot install, php_dir for channel "pecl.php.net" is not writeable by the current user
body: <p>I'm trying to instal oAuth on OS X, but I am getting this error in the Terminal:</p>
  
  <blockquote>
    <p>Cannot install, php_dir for channel "pecl.php.net" is not writeable by the current user</p>
  </blockquote>
  
  <p>How do I allow it to be writable?</p>