This ebuild fetch from cvs gtk2 brunch of sylpheed-claws and compile it Reproducible: Always Steps to Reproduce: 1. 2. 3.
Created attachment 45143 [details] sylpheed-claws-gtk2-cvs-20041202.ebuild
You may want to change the line myconf="${myconf} `use_enable crypt gpgme`" to myconf="${myconf} `use_enable crypt pgpmime-plugin`" to take into account that fact that pgp functions have been moved to the plugin. If you nitice using -crypt with your way, still builds (attempts to build) the plugin.
I'm not going to add cvs ebuilds for this, however Colin released an unofficial gtk2 tarball recently and there will be an ebuild for that one.