Here is an ebuild for xfce4-dev-tools. It's used to generate configure scripts for xfce4 snapshots. Reproducible: Always Steps to Reproduce:
Created attachment 69955 [details] xfce4-dev-tools-4.3.0.ebuild
Thanks for the build, but I have no plans on adding to the official tree at this time. There are many people with unofficial ebuilds for SVN Xfce sources that should suffice.