{
  outputs = { self, nixpkgs, flake-utils }: flake-utils.lib.eachDefaultSystem (system:
    let
      pkgs = import nixpkgs { inherit system; };

      coq = pkgs.coq;

      coqPackages = pkgs.mkCoqPackages coq;

      unimath = pkgs.stdenv.mkDerivation {
        name = "unimath";
        src = pkgs.fetchFromGitHub {
          owner = "unimath";
          repo = "unimath";
          rev = "v20240331";
          sha256 = "sha256-HqAft5pFQbBHQfmvUZEqozVZjnGBlJ5Y8A983JQxQSs=";
        };
        buildInputs = with pkgs;[
          coq
          git
          gnumake
          ocamlPackages.camlp5
          ocamlPackages.findlib
          ocamlPackages.num
        ];
        buildPhase = ''
          echo $NIX_BUILD_CORES
          make -j $NIX_BUILD_CORES
        '';
      };
    in
    {
      packages = { inherit unimath; };

      devShell = pkgs.mkShell {

        packages = [
          coq
          coqPackages.vscoq-language-server
          coqPackages.coq-lsp
        ];
      };
    });
}