{
  description = "A very basic flake";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
  };

  outputs = { self, nixpkgs }: {
    devShells.x86_64-linux.default = let pkgs = nixpkgs.legacyPackages.x86_64-linux;
      in pkgs.mkShell {
        buildInputs = with pkgs; [
          git
          swiProlog
        ];
        shellHook = ''
          echo hi
        '';
      };
    packages.x86_64-linux.hello = nixpkgs.legacyPackages.x86_64-linux.hello;

    packages.x86_64-linux.default = self.packages.x86_64-linux.hello;

  };
}