{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    systems.url = "github:nix-systems/default";
    devenv.url = "github:cachix/devenv";
    devenv.inputs.nixpkgs.follows = "nixpkgs";
  };

  nixConfig = {
    extra-trusted-public-keys =
      "devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw=";
    extra-substituters = "https://devenv.cachix.org";
  };

  outputs = { self, nixpkgs, devenv, systems, ... }@inputs:
    let forEachSystem = nixpkgs.lib.genAttrs (import systems);
    in {
      packages = forEachSystem (system: {
        devenv-up = self.devShells.${system}.default.config.procfileScript;
        devenv-test = self.devShells.${system}.default.config.test;
      });

      devShells = forEachSystem (system:
        let pkgs = nixpkgs.legacyPackages.${system};
        in {
          default = devenv.lib.mkShell {
            inherit inputs pkgs;
            modules = [rec {
              # https://devenv.sh/reference/options/
              packages = with pkgs; [
                hello
                udev
                alsa-lib
                vulkan-loader
                xorg.libX11
                xorg.libXcursor
                xorg.libXi
                #xorg.libXrandr # To use the x11 feature
                libxkbcommon
                wayland # To use the wayland feature
              ];
              #env = {
              #  RUST_SRC_PATH = "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
              #};
              enterShell = ''
                hello
              '';
              env = { LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath packages; };
              languages.rust = { enable = true; };
              processes.hello.exec = "hello";
            }];
          };
        });
    };
}