anchor.diff:      sha256 = "0bd17g6znn2r98gzpjppsqjg33iraky4px923j3k8kdl8qgy7sad";
     };
   
  -  outputs = [ "dev" "out" "bin" "doc" "py" ];
  -  propagatedBuildOutputs = "out bin py";
  +  outputs = [ "dev" "out" "bin" "doc" ]
  +    ++ lib.optional supportPython "py";
  +  propagatedBuildOutputs = "out bin" + lib.optionalString supportPython " py";
   
  -  buildInputs = [ python ]
  +  buildInputs = lib.optional supportPython python
       # Libxml2 has an optional dependency on liblzma.  However, on impure
       # platforms, it may end up using that from /usr/lib, and thus lack a
       # RUNPATH for that, leading to undefined references for its users.
  -    ++ stdenv.lib.optional stdenv.isFreeBSD xz;
  +    ++ lib.optional stdenv.isFreeBSD xz;
   
     propagatedBuildInputs = [ zlib findXMLCatalogs ];
   
  -  configureFlags = "--with-python=${python}";
  +  configureFlags = lib.optional supportPython "--with-python=${python}";
   
     enableParallelBuilding = true;
   
  -  preInstall = ''substituteInPlace python/libxml2mod.la --replace "${python}" "$py"'';
  -  installFlags = ''pythondir="$(py)/lib/${python.libPrefix}/site-packages"'';
  +  crossAttrs = lib.optionalAttrs (stdenv.cross.libc == "msvcrt") {
  +    # creating the DLL is broken ATM
  +    dontDisableStatic = true;
  +    configureFlags = configureFlags ++ [ "--disable-shared" ];
  +
  +    # libiconv is a header dependency - propagating is enough
  +    propagatedBuildInputs =  [ findXMLCatalogs libiconv ];
  +  };
  +
  +  preInstall = lib.optionalString supportPython
  +    ''substituteInPlace python/libxml2mod.la --replace "${python}" "$py"'';
  +  installFlags = lib.optionalString supportPython
  +    ''pythondir="$(py)/lib/${python.libPrefix}/site-packages"'';
   
     postFixup = ''
       moveToOutput bin/xml2-config "$dev"
  
positive.code: { stdenv, fetchurl, zlib, xz, python, findXMLCatalogs }:
  
  stdenv.mkDerivation rec {
    name = "libxml2-${version}";
  
negative.code:     moveToOutput share/man/man1 "$bin"
    '';
  
    passthru = { inherit version; pythonSupport = supportPython; };
  
    meta = {
      homepage = http://xmlsoft.org/;
      description = "An XML parsing library for C";
      license = "bsd";
      platforms = lib.platforms.unix;
      maintainers = [ lib.maintainers.eelco ];
    };
  }
  