Install GTK+ on ubuntu

I tried to install GTK+ manually by compiling each dependencies it required.
Finally I failed.
A huge masses!

This simple command saved me at last.

sudo apt-get install libgtk2.0-dev

it will install GTK+ automatically .
By the following command, you can have the document for developers.

sudo apt-get install libgtk2.0-doc devhelp

Now you have both library and document.
Enjoy them !