{
  nixConfig = {
    extra-substituters = [
      "https://nix-community.cachix.org"
    ];
    extra-trusted-public-keys = [
      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
    ];
  };

  description = "A flake for exposing custom Nix packages";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs =
    {
      self,
      nixpkgs,
      flake-utils,
    }:
    flake-utils.lib.eachDefaultSystem (
      system:
      let
        # Allow the CUDA EULA packages (cuda_nvcc, etc.) needed by the
        # CUDA-enabled comfyui package.
        pkgs = import nixpkgs {
          inherit system;
          config.allowUnfree = true;
        };
      in
      {
        packages = import ./pkgs {
          inherit pkgs;
        };

        devShells.default = import ./devshells {
          inherit pkgs;
        };

        checks = import ./checks { inherit pkgs; };
      }
    )
    // {
      overlays.default = import ./overlays;
    };
}