Install fileinfo php extension

This extension is enabled by default as of PHP 5.3.0. Before this time, fileinfo was a PECL extension but is no longer maintained there. However, versions prior to 5.3+ may use the » discontinued PECL extension.

Reference:

http://www.php.net/manual/en/fileinfo.installation.php

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ERROR: `phpize' failed

This error is displayed because you don't have php-devel package installed

Are you install php-devel?
phpize execute need's php-devel package. if you are on centos run the following code

yum install php-devel