{
  description = "Pijul implementation in lean";

  inputs = {
    lean = {
      url = github:yatima-inc/lean4/acs/add-nix-ability-for-native-libs;
    };

    nixpkgs.url = github:nixos/nixpkgs/nixos-21.05;
    flake-utils = {
      url = github:numtide/flake-utils;
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, lean, flake-utils, nixpkgs }:
    let
      supportedSystems = [
        # "aarch64-linux"
        # "aarch64-darwin"
        "i686-linux"
        "x86_64-darwin"
        "x86_64-linux"
      ];
    in
    flake-utils.lib.eachSystem supportedSystems (system:
      let
        leanPkgs = lean.packages.${system};
        pkgs = nixpkgs.legacyPackages.${system};
        name = "Pijul";
        project = leanPkgs.buildLeanPackage {
          inherit name;
          src = ./src;
        };
        joinDepsDerivationns = getSubDrv:
          pkgs.lib.concatStringsSep ":" (map (d: "${getSubDrv d}") ([ project ] ++ (builtins.attrValues project.allExternalDeps)));
      in
      {
        inherit project;
        packages = {
          inherit (project) modRoot sharedLib staticLib;
        };

        # checks.tests = tests;

        defaultPackage = project.executable;
        devShell = pkgs.mkShell {
          buildInputs = [ leanPkgs.lean ];
          LEAN_PATH = joinDepsDerivationns (d: d.modRoot);
          LEAN_SRC_PATH = joinDepsDerivationns (d: d.src);
        };
      });
}