anchor.diff:    src = fetchurl {
       urls = map (n: "${n}.xz") tarballUrls;
       hashOutput = false;
  -    sha256 = "d43ac068afcc350a448f4581b6e292331ef7e4e7aa746e34981582d5fdb10067";
  +    sha256 = "48d4616a99d7b609b7b795c0ae8ec57099fb0271ed89253e8772c02327798355";
     };
   
     nativeBuildInputs = [
  
positive.code:     };
    };
  
    meta = with stdenv.lib; {
      homepage = http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2;
      description = "A collection of utilities for controlling TCP/IP networking and traffic control in Linux";
      license = licenses.gpl2;
  
negative.code: , bison
  , fetchurl
  , flex
  , lib
  
  , db
  , iptables
  }:
  
  let
    version = "4.15.0";
  
    tarballUrls = [
      "mirror://kernel/linux/utils/net/iproute2/iproute2-${version}.tar"
  