anchor.diff:  }:
   
   let
  -  version = "4.17.0";
  +  version = "4.18.0";
   
     tarballUrls = [
       "mirror://kernel/linux/utils/net/iproute2/iproute2-${version}.tar"
  
positive.code:     elfutils
      iptables
      libcap
      #libmnl  header conflicts
    ];
  
    preConfigure = ''
  
negative.code:   src = fetchurl {
      urls = map (n: "${n}.xz") tarballUrls;
      hashOutput = false;
      sha256 = "a9e6c70c95f513871c5e1f4e452c04fcb3c4d8a05be651bd794cd994a52daa45";
    };
  
    nativeBuildInputs = [
  