Trouble with watir install

I have been having trouble trying to get Watir to work on my Windows 7 x64 machine. I am using the following:

I first install the ruby.exe listed above, and that seemed to go fine when installed to c:\ruby193. I then extracted the dev kit listed above, to c:\devkit. I then switched to c:\rubydev and ran ruby dk.rb init and opened the config.yml file to make sure it was correct, it was. I then ran ruby dk.rb install and that seemed to go fine, and got the following as a result:

[INFO] Updating convenience notice gem override for 'C:/Ruby193'
[INFO] Installing 'C:/Ruby193/lib/ruby/site_ruby/devkit.rb'

The problem comes when I try to install watir. I typed gem install watir and got the following:

C:\Ruby193>gem install watir
Fetching: commonwatir-4.0.0.gem (100%)
Fetching: multi_json-1.7.9.gem (100%)
Fetching: rubyzip-0.9.9.gem (100%)
Fetching: ffi-1.9.0-x86-mingw32.gem (100%)
Fetching: childprocess-0.3.9.gem (100%)
Fetching: websocket-1.0.7.gem (100%)
Fetching: selenium-webdriver-2.35.0.gem (100%)
Fetching: watir-webdriver-0.6.4.gem (100%)
Fetching: win32-process-0.7.2.gem (100%)
Fetching: win32-api-1.4.9-x86-mingw32.gem (100%)
Fetching: windows-api-0.4.2.gem (100%)
Fetching: windows-pr-1.2.2.gem (100%)
Fetching: mini_portile-0.5.1.gem (100%)
Fetching: nokogiri-1.6.0.rc1.gem (100%)
Temporarily enhancing PATH to include DevKit...
Building native extensions.  This could take a while...
ERROR:  Error installing watir:
        ERROR: Failed to build gem native extension.

        C:/Ruby193/bin/ruby.exe extconf.rb
checking for libxml/parser.h... no
libxml2 is missing.  please visit for help with installing dependencies.
*** 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:

Gem files will remain installed in C:/Ruby193/lib/ruby/gems/1.9.1/gems/nokogiri-1.6.0.rc1 for inspection.
Results logged to C:/Ruby193/lib/ruby/gems/1.9.1/gems/nokogiri-1.6.0.rc1/ext/nokogiri/gem_make.out

I am not sure what to do from here, I have tried to clean the directories and do the process again but can't seem to get past this.

My ultimate goal is to get Watir installed so I can do automated testing in IE.


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