anchor.diff:    src = fetchurl {
       urls = tarballUrls version;
       hashOutput = false;
  -    sha256 = "ada1437a4165a707b3e9f37b5b74dbbe7c2f8bde633b8c2c7dbc8f84f39baa09";
  +    sha256 = "cdceff00ffe014495bed3aed71c7910aa88bf29379f795abc0f46d4ee5f8bc5f";
     };
   
     buildInputs = [
  
positive.code:   passthru = {
      srcVerification = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "1.14";
        pgpsigUrls = map (n: "${n}.sig") urls;
        pgpKeyFingerprint = "325F 650C 4C2B 6AD5 8807  327A 3602 B07F 55D0 C732";
        inherit (src) outputHashAlgo;
        outputHash = "ada1437a4165a707b3e9f37b5b74dbbe7c2f8bde633b8c2c7dbc8f84f39baa09";
      };
    };
  
  
negative.code: }:
  
  let
    version = "1.14.1";
  
    tarballUrls = version: [
      "mirror://gnu/gdbm/gdbm-${version}.tar.gz"
  