Trying to install rubber gem, Nokogiri messing it up? - ruby-on-rails

Question

I am trying to install the rubber gem. A couple days ago, I was fooling around with Nokogiri, but couldn't get it properly installed. I forgot about it because it was not pressing. Well now I am trying to install the rubber gem and am getting these errors that confuse me and they seem to be related to Nokogiri, which is not installed to my knowledge. Help me out, thank you.
#THRILLHO:~$ gem install rubber
Building native extensions. This could take a while...
ERROR: Error installing rubber:
ERROR: Failed to build gem native extension.
/home/noonan/.rvm/rubies/ruby-1.9.3-p327/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/noonan/.rvm/rubies/ruby-1.9.3-p327/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
--with-libxslt-config
--without-libxslt-config
--with-pkg-config
--without-pkg-config
--with-libxml-2.0-config
--without-libxml-2.0-config
--with-libiconv-config
--without-libiconv-config
Gem files will remain installed in /home/noonan/.rvm/gems/ruby-1.9.3-p327/gems/nokogiri-1.5.6 for inspection.
Results logged to /home/noonan/.rvm/gems/ruby-1.9.3-p327/gems/nokogiri-1.5.6/ext/nokogiri /gem_make.out

Answer 1

Do this: sudo apt-get install libxslt-dev libxml2-dev and then install rubber again
The error message is very clear: libxml2 is missing. please visit http://nokogiri.org/tutorials/installing_nokogiri.html for help with installing dependencies.