anchor.diff:  { stdenv
   , fetchurl
  +, lib
   }:
   
   let
  -  version = "4.11";
  +  version = "4.13";
   
     tarballUrls = [
       "mirror://kernel/software/network/ethtool/ethtool-${version}.tar"
  
positive.code:   src = fetchurl {
      urls = map (n: "${n}.xz") tarballUrls;
      hashOutput = false;
      sha256 = "12d8edaa8064966b8ef19cc44fecc096a68828035b6a1f2c67a27531a718e1b2";
    };
  
    passthru = {
  
negative.code:     };
    };
  
    meta = with lib; {
      description = "Utility for controlling network drivers and hardware";
      homepage = https://www.kernel.org/pub/software/network/ethtool/;
      license = licenses.gpl2;
  