Absolutely adorable, it goes straight into my “games” category with `bb` and `oneko`. As it only takes a minute, is good practice, and may be helpful for others, here is a quick minimal Nix expression:

    # vim: set ts=8 sw=2 sts=2 et:
    #
    # nix-build --no-out-link -E 'with import <nixpkgs> {}; callPackage ./default.nix {}'
    
    { pkgs ? import <nixpkgs> { }, ncurses, pkg-config, stdenv }:
    stdenv.mkDerivation rec {
      version = "1.0.0";
      pname = "cbonsai";
      src = pkgs.fetchFromGitLab {
        owner = "jallbrit";
        repo = pname;
        rev = "v${version}";
        sha256 = "1jc34j627pnyjgs8hjxqaa89j24gyf0rq9w61mkhgg0kria62as7";
      };
      nativeBuildInputs = [ pkg-config ];
      buildInputs = [ ncurses ];
      installFlags = [ "PREFIX=$(out)" ];
    }