{
  description = "C++ dev environment";

  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
      systems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
      forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f {
        pkgs = import nixpkgs { inherit system; };
      });
    in
    {
      packages = forAllSystems ({ pkgs }: {
        default = pkgs.stdenv.mkDerivation {
          pname = "hello-cpp";
          version = "0.1.0";
          src = ./.;
          buildPhase = ''
            $CXX -std=c++17 -O2 -Wall -Wextra -o hello hello.cpp
          '';
          installPhase = ''
            mkdir -p $out/bin
            cp hello $out/bin/
          '';
        };
      });

      devShells = forAllSystems ({ pkgs }: {
        default = pkgs.mkShell {
          packages = with pkgs; [
            gcc
            gdb
            clang-tools
            cmake
          ];
        };
      });

      apps = forAllSystems ({ pkgs }: {
        default = {
          type = "app";
          program = "${self.packages.${pkgs.system}.default}/bin/hello";
        };
      });
    };
}