0) Download the thin client python code:
http://www.mtier.org/products/thin-client/
1) install from pkg_add: gtk+3 , python3.
2) install from src: pycairo, pygobject .
PYTHON=python3.2 ./configure
Makefile err may need to be corrected manually.
3) modify /etc/X11/xinit/xinitrc for startx automatically.
p.s. *.pc files for pkg-config need to be linked to /usr/lib/pkg-config .