title: php extension fileinfo install in Ubuntu(15.10)
body: <p>I have tried to install php fileinfo extension in Ubuntu(15.10) and getting errors:</p>
  
  <pre><code>sudo pecl install fileinfo
  </code></pre>
  
  <p>Error:</p>
  
  <pre><code>WARNING: "pear/Fileinfo" is deprecated in favor of "channel://php-src/ext/fileinfo/in php sources"
  WARNING: channel "pear.php.net" has updated its protocols, use "pecl channel-update pear.php.net" to update
  downloading Fileinfo-1.0.4.tgz ...
  Starting to download Fileinfo-1.0.4.tgz (5,835 bytes)
  .....done: 5,835 bytes
  3 source files, building
  running: phpize
  Cannot find config.m4.
  Make sure that you run '/usr/bin/phpize' in the top level source directory of the module
  
  If the command failed with 'phpize: not found' then you need to install php5-dev packageYou can do it by running 'apt-get install php5-dev' as a root userERROR: `phpize' failed
  </code></pre>
  
  <p>and then I tried this command:</p>
  
  <pre><code>sudo apt-get install php5-dev
  </code></pre>
  
  <p>Output:</p>
  
  <pre><code>Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  php5-dev is already the newest version.
  The following packages were automatically installed and are no longer required:
    linux-headers-4.2.0-16 linux-headers-4.2.0-16-generic
    linux-image-4.2.0-16-generic linux-image-extra-4.2.0-16-generic
    linux-signed-image-4.2.0-16-generic
  Use 'apt-get autoremove' to remove them.
  0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.
  </code></pre>
  
  <p>How I can install php fileinfo extension?
  How I can enable this extension?</p>