anchor.diff:    src = fetchurl {
       urls = map (n: "${n}.xz") tarballUrls;
       hashOutput = false;
  -    sha256 = "12d8edaa8064966b8ef19cc44fecc096a68828035b6a1f2c67a27531a718e1b2";
  +    sha256 = "b7c1a380007d30eaf261a63b3cfc000f9d93f9eb7626dcd48b5d2a733af99cba";
     };
   
     passthru = {
  
positive.code:     };
    };
  
    meta = with stdenv.lib; {
      description = "Utility for controlling network drivers and hardware";
      homepage = https://www.kernel.org/pub/software/network/ethtool/;
      license = licenses.gpl2;
  
negative.code: { stdenv
  , fetchurl
  , lib
  }:
  
  let
    version = "4.13";
  
    tarballUrls = [
      "mirror://kernel/software/network/ethtool/ethtool-${version}.tar"
  