Que estoy haciendo mal

[Ronruby]

Es una directiva que se llama short_open_tag. Por eso es siempre bueno usar las etiquetas completas.

http://php.net/manual/en/ini.core.php

Tells PHP whether the short form (<? ?>) of PHP's open tag should be allowed. If you want to use PHP in combination with XML, you can disable this option in order to use <?xml ?> inline. Otherwise, you can print it with PHP, for example: <?php echo '<?xml version="1.0"?>'; ?>. Also, if disabled, you must use the long form of the PHP open tag (<?php ?>).