anchor.diff:    src = fetchurl {
       urls = map (n: "${n}.gz") tarballUrls;
       hashOutput = false;
  -    sha256 = "a87edaa35a33a76006a7ccd30f326514db78ac235b3a257402441349bc0da9b4";
  +    sha256 = "232e54b87c53210a6861424ad411b04dbfa0f2ca4bc463aefea188158e0cc963";
     };
   
     nativeBuildInputs = [
  
positive.code: }:
  
  let
    # 1.4.1 breaks samba 4.8.x
    name = "ldb-1.4.0";
  
    tarballUrls = [
      "mirror://samba/ldb/${name}.tar"
  
negative.code:   passthru = {
      srcVerification = fetchurl {
        failEarly = true;
        inherit (src)
          urls
          outputHash
          outputHashAlgo;
        fullOpts = {
          pgpsigUrls = map (n: "${n}.asc") tarballUrls;
          pgpDecompress = true;
          inherit (samba_full.pgp.library)
            pgpKeyFingerprint;
        };
      };
    };
  
  