Error libxml2 is missing while Installing Nokogiri

Error
gem install nokogiri
Installing nokogiri (1.5.0) with native extensions 
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /home/user/.rvm/rubies/ruby-1.9.2-p290/bin/ruby extconf.rb 
checking for libxml/parser.h... no
-----
libxml2 is missing.  please visit http://nokogiri.org/tutorials/installing_nokogiri.html 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:
 --with-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=/home/user/.rvm/rubies/ruby-1.9.2-p290/bin/ruby
 --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-iconv-dir
 --without-iconv-dir
 --with-iconv-include
 --without-iconv-include=${iconv-dir}/include
 --with-iconv-lib
 --without-iconv-lib=${iconv-dir}/lib
 --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-xslt-dir
 --without-xslt-dir
 --with-xslt-include
 --without-xslt-include=${xslt-dir}/include
 --with-xslt-lib
 --without-xslt-lib=${xslt-dir}/lib


Gem files will remain installed in /home/user/.rvm/gems/ruby-1.9.2-p290/gems/nokogiri-1.5.0 for inspection.
Results logged to /home/user/.rvm/gems/ruby-1.9.2-p290/gems/nokogiri-1.5.0/ext/nokogiri/gem_make.out
An error occured while installing nokogiri (1.5.0), and Bundler cannot continue.
Make sure that `gem install nokogiri -v '1.5.0'` succeeds before bundling.
Solution
sudo apt-get install libxslt-dev libxml2-dev

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