ferret is a modern client for the gopher protocol. Currently (0.3.0) only Linux is supported.
To build, you'll need cmake, which you can get from your package manager or https://cmake.org/.
(Previous versions of ferret required libui, but this requirement has been dropped in favour of GTK.)
cd into the directory where you placed the ferret source, then run
./build.sh
sudo ./install.sh
and you're good to go!