1. Get Gimp 2.2.8 from
the Gimp home page
2. Extract the tarball using the kde file manager to a place of your choice. For me this was my home directory.
3. Naviagte to the extracted Gimp directory and choose Tools--> open terminal from the file manager.
4. Follow the usual installation sequence;
./confiure
make
(as root user) Make install
5. If the installation completes successfully, you can remove the unecessary files with "make clean."