gimp-razor is

a script to automate the process of compiling the gimp’s latest development version and its dependencies. It's primarily intended to be used on Ubuntu, but with a little work, it should work on any linux distro.

Usage

sudo apt-get install git-core
git clone git://github.com/zanshine/gimp-razor.git
cd gimp-razor
./gimp-razor

For more customization, see the top of the script.

For more details:

http://www.zanshine.com/blog/stephane-richard/software/2011-10-05/cutting-edge-gimp-in-latest-ubuntu/