anchor.diff: -{ lib, stdenv
  +{ lib
  +, stdenv
   , fetchFromGitHub
   , cmake
   , openssl
  +, nix
   }:
   
   stdenv.mkDerivation rec {
  
positive.code: 
    nativeBuildInputs = [ cmake ];
  
    outputs = [ "out" "dev"];
  
    buildInputs = [ openssl ]; # s2n-config has find_dependency(LibCrypto).
  
  
negative.code:     done
    '';
  
    passthru.tests = {
      inherit nix;
    };
  
    meta = with lib; {
      description = "C99 implementation of the TLS/SSL protocols";
      homepage = "https://github.com/aws/s2n-tls";
  