php issue

Ok so my current VPS provider is going out of business and I have to move my site to another VPS.
I have the following php codes in my site.
<a href="<?=get_permalink(74);?>">Breast Augmentation</a>
The code above works on my current VPS but not on the new one.
If I change the code to the one bellow it does work on my new VPS.
<a href="<?php echo get_permalink(74);?>">Breast Augmentation</a>

So, on the new VPS “<?=” does not work but “<?php echo” does

My question is why? Is there a PHP issue at hand here a minimum PHP version required . My new server is centos 6.5 and php version 5.3.3
Or is there a PHP module i have missed to install?
Any and all help is greatly appreciated.