What is X11 and Why does GIMP require it

Hello all,
I use GIMP at work on a Windows workstation, and love it.  I have just downloaded the mac version but on boot up it prompts me to locate the 'X11'.
What is X11?
where is it located?
and
Why does GIMP need it so badly?
Thanking you all in advance

If I recall X11 is an optional install on your installer dvd's.  I don't remember if it's a option on the main install or an addition on the second dvd.
When it gets installed the X11 app will be in your /Applications/Utilities folder.  There is also additional stuff the app needs in other directories on your boot drive as well.
As for what X11 is, here's a wiki reference.  Basically the mac version of gimp needs x11 as it's windowing layer (probably the easiest way to port gimp to the mac).

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