nixpkgs/pkgs/development/interpreters/lfe/1.2.nix

{ mkDerivation }:

mkDerivation {
  version = "1.2.1";
  sha256 = "0j5gjlsk92y14kxgvd80q9vwyhmjkphpzadcswyjxikgahwg1avz";
  maximumOTPVersion = "19";
}