anchor.diff:    tarballUrls = base: patch: map (n: "${n}/util-linux-${version base patch}.tar") (baseUrls base);
   
     base = "2.31";
  -  patch = null;
  +  patch = "1";
   in
   stdenv.mkDerivation rec {
     name = "${type}util-linux-${version base patch}";
  
positive.code:   src = fetchurl {
      urls = map (n: "${n}.xz") (tarballUrls base patch);
      hashOutput = false;
      sha256 = "f9be7cdcf4fc5c5064a226599acdda6bdf3d86c640152ba01ea642d91108dc8a";
    };
  
    nativeBuildInputs = [
  
negative.code:   installParallel = false;
  
    passthru = {
      srcVerification =
        let
          base = "2.31";
          patch = "1";
        in
        fetchurl {
          failEarly = true;
          urls = map (n: "${n}.xz") (tarballUrls base patch);
          pgpsigUrls = map (n: "${n}.sign") (tarballUrls base patch);
          pgpsigSha256Urls = map (n: "${n}/sha256sums.asc") (baseUrls base);
          pgpKeyFingerprint = "B0C6 4D14 301C C6EF AEDF  60E4 E4B7 1D5E EC39 C284";
          pgpDecompress = true;
          outputHash = "1a51b16fa9cd51d26ef9ab52d2f1de12403b810fc8252bf7d478df91b3cddf11";
          inherit (src) outputHashAlgo;
        };
    };
  
    meta = with stdenv.lib; {
  