After wrestling a bit with GTK+, I was able to get Phoenix installed on my Gentoo box. The problem ended up being portage hiding the GTK+ 1.2 ebuild since I already had GTK+ 2.x installed. After some digging on the Gentoo forums I found you can in fact have both GTK+ 1.2 and GTK+ 2.x installed, you just need to implicitly call the GTK+ 1.2 ebuild in order to get it to install.

Now I just need to figure out how to get some AA fonts working so Phoenix doesn’t look like ass when it is running.