Install libxml-ruby-2.3.3 @ Marvericks

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I try to install libxml-ruby-2.3.3 at MacOSX Marvericks via gem (rbenv, Ruby-2.1.0), get below errors:

  Building native extensions.  This could take a while...
  ERROR:  Error installing libxml-ruby:
          ERROR: Failed to build gem native extension.

      /Users/***/.rbenv/versions/2.1.0/bin/ruby extconf.rb
  extconf.rb:17:in `<main>': Use RbConfig instead of obsolete and deprecated Config.
  extconf.rb:17:in `<main>': Use RbConfig instead of obsolete and deprecated Config.
  checking for socket() in -lsocket... no
  checking for gethostbyname() in -lnsl... no
  checking for atan() in -lm... yes
  checking for inflate() in -lz... yes
  checking for iconv_open() in -liconv... yes
  checking for xmlParseDoc() in -lxml2... yes
  checking for libxml/xmlversion.h... yes
  creating extconf.h
  creating Makefile

  make "DESTDIR=" clean

  make "DESTDIR="
  compiling libxml.c
  compiling ruby_xml.c
  ruby_xml.c:612:23: warning: assigning to 'const char *' from 'xmlChar *' (aka 'unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]
  xmlTreeIndentString = xmlStrdup((xmlChar *)StringValuePtr(string));
                      ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  1 warning generated.
  compiling ruby_xml_attr.c
  compiling ruby_xml_attr_decl.c
  ruby_xml_attr_decl.c:57:53: warning: passing 'const xmlChar *' (aka 'const unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
      return rxml_new_cstr((const char*) xattr->name, xattr->doc->encoding);
                                                      ^~~~~~~~~~~~~~~~~~~~
  ./ruby_xml_encoding.h:11:51: note: passing argument to parameter 'xencoding' here
  VALUE rxml_new_cstr(const char* xstr, const char* xencoding);
                                                    ^
  1 warning generated.
  compiling ruby_xml_attributes.c
  compiling ruby_xml_cbg.c
  compiling ruby_xml_document.c
  ruby_xml_document.c:331:5: warning: incompatible pointer types passing 'xmlChar *(*)[256]' to parameter of type 'xmlChar **' (aka 'unsigned char **') [-Wincompatible-pointer-types]
      &inc_ns_prefixes_ptr,
      ^~~~~~~~~~~~~~~~~~~~
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include/libxml2/libxml/c14n.h:79:17: note: passing argument to parameter 'inclusive_ns_prefixes' here
                                           xmlChar **inclusive_ns_prefixes,
                                                     ^
  ruby_xml_document.c:805:13: warning: assigning to 'const char *' from 'const xmlChar *' (aka 'const unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]
    xencoding = xdoc->encoding;
              ^ ~~~~~~~~~~~~~~
  2 warnings generated.
  compiling ruby_xml_dtd.c
  compiling ruby_xml_encoding.c
  compiling ruby_xml_error.c
  compiling ruby_xml_html_parser.c
  compiling ruby_xml_html_parser_context.c
  compiling ruby_xml_html_parser_options.c
  compiling ruby_xml_input_cbg.c
  compiling ruby_xml_io.c
  compiling ruby_xml_namespace.c
  compiling ruby_xml_namespaces.c
  compiling ruby_xml_node.c
  ruby_xml_node.c:622:54: error: incomplete definition of type 'struct _xmlBuf'
      result = rxml_new_cstr((const char*) output->conv->content, xencoding);
                                           ~~~~~~~~~~~~^
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include/libxml2/libxml/tree.h:104:16: note: forward declaration of 'struct _xmlBuf'
  typedef struct _xmlBuf xmlBuf;
                 ^
  ruby_xml_node.c:624:56: error: incomplete definition of type 'struct _xmlBuf'
      result = rxml_new_cstr((const char*) output->buffer->content, xencoding);
                                           ~~~~~~~~~~~~~~^
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include/libxml2/libxml/tree.h:104:16: note: forward declaration of 'struct _xmlBuf'
  typedef struct _xmlBuf xmlBuf;
                 ^
  2 errors generated.
  make: *** [ruby_xml_node.o] Error 1

  make failed, exit code 2

  Gem files will remain installed in /Users/***/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/libxml-ruby-2.3.3 for inspection.
  Results logged to /Users/***/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/extensions/x86_64-darwin-13/2.1.0-static/libxml-ruby-2.3.3/gem_make.out

libxml-ruby-2.3.3-marvericks.patch

diff libxml-ruby-2.3.3.orig/ext/libxml/ruby_xml_document.c libxml-ruby-2.3.3/ext/libxml/ruby_xml_document.c
331c331
<     &inc_ns_prefixes_ptr,
---
>     inc_ns_prefixes_ptr,
diff libxml-ruby-2.3.3.orig/ext/libxml/ruby_xml_node.c libxml-ruby-2.3.3/ext/libxml/ruby_xml_node.c
620a621,626
> #ifdef LIBXML2_NEW_BUFFER
>   if (output->conv)
>     result = rxml_new_cstr((const char*) xmlBufContent(output->conv), xencoding);
>   else
>     result = rxml_new_cstr((const char*) xmlBufContent(output->buffer), xencoding);
> #else
624a631
> #endif