anchor.diff:      "--without-debugger"
     ];
   
  +  passthru = {
  +    srcVerified = fetchurl rec {
  +      failEarly = true;
  +      urls = tarballUrls "1.1.29";
  +      pgpsigUrls = map (n: "${n}.asc") urls;
  +      pgpKeyFingerprint = "C744 15BA 7C9C 7F78 F02E  1DC3 4606 B8A5 DE95 BC1F";
  +      inherit (src) outputHashAlgo;
  +      outputHash = "b5976e3857837e7617b29f2249ebb5eeac34e249208d31f1fbf7a6ba7a4090ce";
  +    };
  +  };
  +
     meta = with stdenv.lib; {
       homepage = http://xmlsoft.org/XSLT/;
       description = "A C library and tools to do XSL transformations";
  
positive.code:       wkennington
      ];
      platforms = with platforms;
        i686-linux
        ++ x86_64-linux;
    };
  }
  
negative.code: , libxml2
  }:
  
  let
    tarballUrls = version: [
      "http://xmlsoft.org/sources/libxslt-${version}.tar.gz"
    ];
  
    version = "1.1.29";
  in
  stdenv.mkDerivation rec {
    name = "libxslt-${version}";
  
    src = fetchurl {
      urls = tarballUrls version;
      allowHashOutput = false;
      sha256 = "b5976e3857837e7617b29f2249ebb5eeac34e249208d31f1fbf7a6ba7a4090ce";
    };
  
    buildInputs = [
      libxml2
  