anchor.diff:  
       buildInputs = [
         boehmgc libatomic_ops pcre libevent libyaml
  -      llvm zlib openssl
  +      llvm zlib openssl_1_0_2
       ] ++ stdenv.lib.optionals stdenv.isDarwin [
         libiconv
       ];
  
positive.code: { stdenv, lib, fetchFromGitHub, fetchurl, makeWrapper
  , coreutils, git, gmp, nettools, openssl, readline, tzdata, libxml2, libyaml
  , boehmgc, libatomic_ops, pcre, libevent, libiconv, llvm, clang, which, zlib
  , callPackage }:
  
  
negative.code: 
    arch = archs."${stdenv.system}" or (throw "system ${stdenv.system} not supported");
  
    checkInputs = [ git gmp openssl_1_0_2 readline libxml2 libyaml ];
  
    genericBinary = { version, sha256s, rel ? 1 }:
    stdenv.mkDerivation rec {
  