anchor.diff:    src = fetchurl {
       urls = map (n: "${n}.xz") baseTarballs;
       hashOutput = false;
  -    sha256 = "245ec2f9abb51bcc233b64f6f3e9ac8e5cd16ffd35dba9450f83ce2803844cda";
  +    sha256 = "3c8c63611c7e78b7a3b2f8a28b9928a5b5e66d5e9ad09a1e54681508884320a4";
     };
   
     buildInputs = [
  
positive.code: }:
  
  let
    version = "2.3.1";
    name = "nfs-utils-${version}";
  
    baseTarballs = [
  
negative.code:   passthru = {
      srcVerification = fetchurl {
        failEarly = true;
        inherit (src)
          urls
          outputHash
          outputHashAlgo;
        fullOpts = {
          pgpsigUrls = map (n: "${n}.sign") baseTarballs;
          pgpDecompress = true;
          pgpKeyFingerprint = "E1B7 1E33 9E20 A10A 676F  7CB6 9AFB 1D68 1A12 5177";
        };
      };
    };
  
  