How to find and install GTK library for debian
hello
I came across a problem in Debian Etch r4.0 today.
 I am already running Firefox 3 which I configured and built but today it updated then gave me this error:"we are sorry this APPLICATION requires a version of the GTK + library that is not installed in your computer"
the problem ,i don't know where to find it can someone have an information?
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Error
We're sorry, this application requires a version of the GTK+library that is not installed on your computer.
You have GTK+ 2.8.
This application requires GTK+ 2.10 or newer.
Please upgrade your GTK+library if you wish to use this application.