This project requires Coq 8.8.2 and Coq-Equations v1.2-8.8. They can both be installed via opam or from source. If you happen to be using the package manager Nix, you can launch a shell with both of them in scope:
nix-shell --packages coq_8_8 coqPackages_8_8.equations
Once those two dependencies are in scope, this project can be compiled as follows:
coq_makefile -f _CoqProject -o makefile
make
Alternatively, to step through the definitions and proofs, you can run
coqide, load the files in src, and press F6 or select Compile -> Make.
You can then interactively walk through the proofs with Ctrl-Down and
Ctrl-Up.