{
  inputs = {
    utils.url = "github:numtide/flake-utils";
    naersk.url = "github:nmattia/naersk";
    mozillapkgs.url = "github:mozilla/nixpkgs-mozilla";
    mozillapkgs.flake = false;
  };

  outputs = { self, nixpkgs, utils, naersk, mozillapkgs }:
    utils.lib.eachDefaultSystem (system: let
      pkgs = nixpkgs.legacyPackages."${system}";
      mozilla = pkgs.callPackage (mozillapkgs + "/package-set.nix") {};
      rust = (mozilla.rustChannelOf {
        channel = "stable";
        date = "2021-10-04";
        sha256 = "0swglfa63i14fpgg98agx4b5sz0nckn6phacfy3k6imknsiv8mrg";
      }).rust;

      # Override the version used in naersk
      naersk-lib = naersk.lib."${system}".override {
        cargo = rust;
        rustc = rust;
      };
    in rec {
      # `nix build`
      packages.heliwatch = naersk-lib.buildPackage {
        pname = "heliwatch";
        root = builtins.filterSource (path: type:
          builtins.elem (baseNameOf path) [
            "src"
            "Cargo.toml"
            "Cargo.lock"
          ] || baseNameOf (dirOf path) == "src"
        ) ./.;
        nativeBuildInputs = with pkgs; [ pkg-config ];
        buildInputs = with pkgs; [ openssl ];
      };
      defaultPackage = packages.heliwatch;

      # `nix run`
      apps.heliwatch = utils.lib.mkApp {
        drv = packages.heliwatch;
      };
      defaultApp = apps.heliwatch;

      # `nix develop`
      devShell = pkgs.mkShell {
        nativeBuildInputs = with defaultPackage;
          nativeBuildInputs ++ buildInputs;
      };
    });
}