anchor.diff:    src = fetchurl {
       urls = map (n: "${n}.xz") tarballUrls;
       hashOutput = false;
  -    sha256 = "6fa991b092315887775b9e47dc6a89af7ae09dd3ad4ccff754d055c566b4be6e";
  +    sha256 = "a9e6c70c95f513871c5e1f4e452c04fcb3c4d8a05be651bd794cd994a52daa45";
     };
   
     nativeBuildInputs = [
  
positive.code:     elfutils
      iptables
      libcap
      #libmnl  header conflicts
    ];
  
    preConfigure = ''
  
negative.code: }:
  
  let
    version = "4.18.0";
  
    tarballUrls = [
      "mirror://kernel/linux/utils/net/iproute2/iproute2-${version}.tar"
  