The ebuild is for the Gentoo linux portage system. These instructions assume already have a local portage overlay located at /usr/local/portage.

Download the tgz to your /usr/local/portage overlay directory.
cd /usr/local/portage/
wget http://analogbit.com/sites/default/files/tcp-over-dns-bin.ebuild.tgz

Extract the ebuild
tar xzvf tcp-over-dns-bin.ebuild.tgz