anchor.diff:        wkennington
       ];
       platforms = with platforms;
  -      i686-linux
  -      ++ x86_64-linux;
  +      x86_64-linux;
     };
   }
  
positive.code: }:
  
  let
    sitePackages = "\${out}/lib/${python.libPrefix}/site-packages";
  in
  
  stdenv.mkDerivation rec {
    name = "libxml2-${version}";
    version = "2.9.3";
  
    src = fetchurl {
      url = "http://xmlsoft.org/sources/${name}.tar.gz";
      sha256 = "0bd17g6znn2r98gzpjppsqjg33iraky4px923j3k8kdl8qgy7sad";
    };
  
    buildInputs = [
  
negative.code:     "--with-lzma=${xz}"
    ];
  
    passthru = {
      srcVerified = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "2.9.4";
        pgpsigUrls = map (n: "${n}.asc") urls;
        pgpKeyFingerprint = "C744 15BA 7C9C 7F78 F02E  1DC3 4606 B8A5 DE95 BC1F";
        inherit (src) outputHashAlgo;
        outputHash = "ffb911191e509b966deb55de705387f14156e1a56b21824357cdf0053233633c";
      };
    };
  
    meta = with stdenv.lib; {
      homepage = http://xmlsoft.org/;
      description = "An XML parsing library for C";
  