I've made an ebuild for gtk-gnutella-9999, from svn. I'm attaching that ebuild, it works. If you want you can add it to the main tree or the sunrise overlay.. It's just a slightly modified version of the working stable ebuild, that takes files from the official svn.
Created attachment 137343 [details] The working svn ebuild.
We are not adding live VCS ebuilds, keep this in your overlay please. http://www.gentoo.org/proj/en/devrel/handbook/handbook.xml?part=3&chap=1#doc_chap3