Customer needs us to install GD for PHP, go or no?

A customer that just joined told us he needs GD for PHP, but didn't know it was not installed by default. Now he is asking us to install it or he will need a refund.

What does it do exactly? If it doesn't stress the server too much and it's safe to do it, should I just install GD? Or can it be enabled in the php conf? We are using cPanel/whm, php 4.3.1.

Thanks

 

 

 

 

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