{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    fenix = {
      url = "github:nix-community/fenix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, fenix, ... }:
  let
    supportedSystems = [
      "aarch64-darwin" "aarch64-linux"
      "x86_64-darwin" "x86_64-linux"
    ];

    each-system = f: nixpkgs.lib.genAttrs supportedSystems (system: f rec {
      pkgs = import nixpkgs {
        inherit system overlays;
      };
      inherit (pkgs) lib;
      inherit system;
    });

    overlays = [
      fenix.overlays.default
    ];

  in {
    _pkgs = each-system ({ pkgs, ... }: pkgs);

    devShells = each-system ({ pkgs, lib, ... }: {
      default = pkgs.mkShell {
        packages = [
          pkgs.pkg-config
          (pkgs.fenix.complete.withComponents [
            "cargo" "clippy" "rust-src" "rustc" "rustfmt"
          ])
          pkgs.rust-analyzer-nightly
          pkgs.cmake
        ];
      };
    });
  };

  nixConfig = {
    extra-substituters = [
      "https://fenix.cachix.org"
    ];
    extra-trusted-public-keys = [
      "fenix.cachix.org-1:ecJhr+RdYEdcVgUkjruiYhjbBloIEGov7bos90cZi0Q="
    ];
  };
}