gem install /SiriProxy/pkg/siriproxy-0.3.0.gem
Building native extensions.  This could take a while...
ERROR:  Error installing /SiriProxy/pkg/siriproxy-0.3.0.gem:
        ERROR: Failed to build gem native extension.

        /usr/local/rvm/rubies/ruby-1.9.3-p0/bin/ruby extconf.rb
extconf.rb:17: Use RbConfig instead of obsolete and deprecated Config.
checking for socket() in -lsocket... no
checking for gethostbyname() in -lnsl... yes
checking for atan() in -lm... no
checking for atan() in -lm... yes
checking for inflate() in -lz... yes
checking for iconv_open() in -liconv... no
checking for libiconv_open() in -liconv... no
checking for libiconv_open() in -llibiconv... no
checking for iconv_open() in -llibiconv... no
checking for iconv_open() in -lc... yes
checking for xmlParseDoc() in -lxml2... no
checking for xmlParseDoc() in -llibxml2... no
checking for xmlParseDoc() in -lxml2... no
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
        --with-opt-dir
        --without-opt-dir
        --with-opt-include
        --without-opt-include=${opt-dir}/include
        --with-opt-lib
        --without-opt-lib=${opt-dir}/lib
        --with-make-prog
        --without-make-prog
        --srcdir=.
        --curdir
        --ruby=/usr/local/rvm/rubies/ruby-1.9.3-p0/bin/ruby
        --with-iconv-dir
        --without-iconv-dir
        --with-iconv-include
        --without-iconv-include=${iconv-dir}/include
        --with-iconv-lib
        --without-iconv-lib=${iconv-dir}/lib
        --with-zlib-dir
        --without-zlib-dir
        --with-zlib-include
        --without-zlib-include=${zlib-dir}/include
        --with-zlib-lib
        --without-zlib-lib=${zlib-dir}/lib
        --with-socketlib
        --without-socketlib
        --with-nsllib
        --without-nsllib
        --with-mlib
        --without-mlib
        --with-mlib
        --without-mlib
        --with-zlib
        --without-zlib
        --with-iconvlib
        --without-iconvlib
        --with-iconvlib
        --without-iconvlib
        --with-libiconvlib
        --without-libiconvlib
        --with-libiconvlib
        --without-libiconvlib
        --with-clib
        --without-clib
        --with-xml2-config
        --without-xml2-config
        --with-xml2-dir
        --without-xml2-dir
        --with-xml2-include
        --without-xml2-include=${xml2-dir}/include
        --with-xml2-lib
        --without-xml2-lib=${xml2-dir}/lib
        --with-xml2lib
        --without-xml2lib
        --with-libxml2lib
        --without-libxml2lib
        --with-xml2lib
        --without-xml2lib
 extconf failure: need libxml2.

    Install the library or try one of the following options to extconf.rb:

      --with-xml2-config=/path/to/xml2-config
      --with-xml2-dir=/path/to/libxml2
      --with-xml2-lib=/path/to/libxml2/lib
      --with-xml2-include=/path/to/libxml2/include



Gem files will remain installed in /usr/local/rvm/gems/ruby-1.9.3-p0@SiriProxy/gems/libxml-ruby-2.2.2 for inspection.
Results logged to /usr/local/rvm/gems/ruby-1.9.3-p0@SiriProxy/gems/libxml-ruby-2.2.2/ext/libxml/gem_make.out