{
  description = "Saber development environment.";

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

  outputs = { self, nixpkgs, saber-overlay, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs {
          inherit system;
          overlays = [ saber-overlay.overlay ];
        };
      in { devShell = import ./shell.nix { inherit pkgs; }; });
}