{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
    fenix = {
      url = "github:nix-community/fenix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };
  outputs = {
    self,
    nixpkgs,
    flake-utils,
    fenix,
  }:
    flake-utils.lib.eachDefaultSystem
    (
      system: let
        overlays = [fenix.overlays.default];
        pkgs = import nixpkgs {
          inherit system overlays;
        };
      in
        with pkgs; {
          devShells.default = mkShell {
            buildInputs = [
              pkgs.fenix.stable.completeToolchain
              pkg-config
              openssl
            ];
          };
          formatter = pkgs.alejandra;
          packages.default = rustPlatform.buildRustPackage {
            name = "smo-server";
            src = ./.;
            nativeBuildInputs = [pkg-config cmake];
            buildInputs = [openssl];
            cargoDeps = rustPlatform.importCargoLock {
              lockFile = ./Cargo.lock;
              outputHashes = {
                "newtype-enum-0.1.0" = "sha256-DBFSgtuwn51U3nvSxa0SQZKEHniC4UFVBHIeQjkXAvw=";
              };
            };
          };
          # nixosModules.default = { config }: with pkgs.lib {
          #   options.services.smo-server = {
          #     enable = mkEnableOption ""
          #   };
          # }
        }
    );
}