(last tested on Fedora 22, those with fedora versions older than 22 should substitute yum for dnf.)
sudo dnf install cjdns
Skip straight down to "Generating a config"
sudo dnf install git nodejs gcc
git clone https://github.com/cjdelisle/cjdns
cd cjdns/
git checkout crashey
./do
./cjdroute --genconf | sudo tee /etc/cjdroute.conf
sudo cp cjdns.service /etc/systemd/system/cjdns.service # This gives systemd some information about cjdns.
sudo systemctl enable cjdns.service #This sets cjdns to be started on boot. if you don't want that, feel free to leave this line out.
sudo systemctl start cjdns.service #This actually starts cjdns.
sudo systemctl status -l cjdns