To be able to run the project (compile the code), start by cloning the repository and then run git submodule init && git submodule update to fetch the submodule ev3dev.
Now you need to make a libraries directory and add the necessary libs. To do so, run the following from the root directory mkdir libraries && cp ev3dev-c/lib/libev3dev-c.a /libraries . Finally, To compile now just run make.