anchor.diff:    src = fetchurl {
       urls = tarballUrls version;
       allowHashOutput = false;
  -    sha256 = "4e5ce3b62fe5d75ff8db92b7f6df91e476d10c3aceebf1639796dc5bfece655f";
  +    sha256 = "d6e262bf3601b42d2b1e4ef8310029e1dcf20083c5446b4b7aa67081fdffc589";
     };
   
     patches = [
  
positive.code: }:
  
  let
    version = "4.2";
  
    tarballUrls = version: [
      "mirror://gnu/make/make-${version}.tar.bz2"
  
negative.code:   passthru = {
      srcVerified = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "4.2.1";
        pgpsigUrls = map (n: "${n}.sig") urls;
        pgpKeyFingerprint = "3D25 54F0 A153 38AB 9AF1  BB9D 96B0 4715 6338 B6D4";
        inherit (src) outputHashAlgo;
        outputHash = "d6e262bf3601b42d2b1e4ef8310029e1dcf20083c5446b4b7aa67081fdffc589";
      };
    };
  
  