{
  description = "Nom Nom Nix GC";

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

  outputs = { self, nixpkgs }:
    let
      systems = [
        "x86_64-linux"
        "aarch64-linux"
      ];
      forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f system);
      pkgs = system: import nixpkgs {
        inherit system;
        overlays = [ self.overlays.default ];
      };
    in {
      defaultPackage = forAllSystems (system: import ./. { pkgs = nixpkgs.legacyPackages.${system}; });
      devShell = forAllSystems (system: nixpkgs.legacyPackages.${system}.callPackage ./shell.nix { });
      formatter = forAllSystems (system:
        nixpkgs.legacyPackages.${system}.nixpkgs-fmt
      );
    };
}