how to enable GD library ?

[Dingding Zhu <dingdingzhu_03@xxxxxxxxx>]

I already have php5.2 installed with apache2.0 and mysql. 
Now I have a project which need GD library.

I installed GD and other library already. However, I need to enable 
GD-support in php.

How to enable that?

Do I need add some line i the php.init?

Thanks very much!

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