The DotGNU Portable.NET project is now located in a git repository on savannah.
The url for anonymous access is git://git.sv.gnu.org/dotgnu-pnet.git.
The project is split in separate submodules so you'll have to do the following to get the submodules:
git clone git://git.sv.gnu.org/dotgnu-pnet.git
cd dotgnu-pnet
git submodule update --init
For pulling updates the following commands have to be issued in the dotgnu-pnet directory:
git pull
git submodule update