flake.nix

{
  description = "Hello world";

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

  outputs = inputs@{ self, nixpkgs, flake-utils, ... }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; overlays = [ ]; };
      in rec {
        # packages.hello = 
        # defaultPackage = packages.hello;
        devShell = pkgs.callPackage ./shell.nix {};
      });
}