anchor.diff:      "https://curl.haxx.se/download/curl-${version}.tar.bz2"
     ];
   
  -  version = "7.49.0";
  +  version = "7.49.1";
   in
   stdenv.mkDerivation rec {
     name = "curl${nameSuffix}-${version}";
  
positive.code:   src = fetchurl {
      urls = tarballUrls version;
      allowHashOutput = false;
      sha256 = "14f44ed7b5207fea769ddb2c31bd9e720d37312e1c02315def67923a4a636078";
    };
  
    nativeBuildInputs = [
  
negative.code:   passthru = {
      srcVerified = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "7.49.1";
        pgpsigUrls = map (n: "${n}.asc") urls;
        pgpKeyFingerprint = "27ED EAF2 2F3A BCEB 50DB  9A12 5CC9 08FD B71E 12C2";
        inherit (src) outputHashAlgo;
        outputHash = "eb63cec4bef692eab9db459033f409533e6d10e20942f4b060b32819e81885f1";
      };
    };
  
  