Unable to install newest libxml-ruby gem - ruby

Question

I am having trouble installing the newest libxml-ruby gem for ruby 2.3.3. Here is the error I am getting:
ERROR: Error installing libxml-ruby:
ERROR: Failed to build gem native extension.
current directory: C:/Ruby-2.3.3/lib/ruby/gems/2.3.0/gems/libxml-ruby-2.9.0/ext/libxml
C:/Ruby-2.3.3/bin/ruby.exe -r ./siteconf20170117-6916-4mgpq6.rb extconf.rb
checking for libxml/xmlversion.h in /opt/include/libxml2,/opt/local/include/libxml2,/usr/local/include/libxml2,/usr/include/libxml2... yes
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=C:/Ruby-2.3.3/bin/$(RUBY_BASE_NAME)
--with-xml2-config
--without-xml2-config
--with-xml2-dir
--without-xml2-dir
--with-xml2-include
--without-xml2-include=${xml2-dir}/include
--with-xml2-lib
--without-xml2-lib=${xml2-dir}/lib
--with-xml2lib
--without-xml2lib
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
To see why this extension failed to compile, please check the mkmf.log which can be found here:
I have found similar issues when looking for a solution, but no answer to the problem. Has anyone been able to fix this?