anchor.diff:  
     buildInputs = [
       gmp
  +    jansson
       iptables
       libmnl
       libnftnl
  
positive.code: }:
  
  stdenv.mkDerivation rec {
    name = "nftables-0.8.5";
  
    src = fetchurl {
      url = "http://netfilter.org/projects/nftables/files/${name}.tar.bz2";
      multihash = "QmNjb4Gw77iY438dS3tm6wnDgKSuvzsJ1GBVZEFJzMf5tg";
      hashOutput = false;
      sha256 = "8e9baf80a1c7f0e19e5b50e469bda4487793d839da45c75e8a20fadcbaeae323";
    };
  
    nativeBuildInputs = [
  
negative.code:     "--without-mini-gmp"
      "--with-cli"
      "--with-xtables"
      "--with-json"
    ];
  
    preInstall = ''
  