Nokogiri failed to build gem native extension (RuntimeError)? - ruby-on-rails

Question

I am trying to install Nokogiri using:
sudo gem install nokogiri
This is the mess that follows the installation:
Building native extensions. This could take a while...
ERROR: Error installing nokogiri:
ERROR: Failed to build gem native extension.
/Users/micahsherman/.rvm/rubies/ruby-1.9.3-p429/bin/ruby extconf.rb
Extracting libxml2-2.8.0.tar.gz into tmp/x86_64-apple-darwin13.0.0/ports/libxml2/2.8.0... OK
Running 'configure' for libxml2 2.8.0... OK
Running 'compile' for libxml2 2.8.0... OK
Running 'install' for libxml2 2.8.0... OK
Activating libxml2 2.8.0 (from /Users/micahsherman/.rvm/gems/ruby-1.9.3-p429/gems/nokogiri-1.6.0/ports/x86_64-apple-darwin13.0.0/libxml2/2.8.0)...
Extracting libxslt-1.1.26.tar.gz into tmp/x86_64-apple-darwin13.0.0/ports/libxslt/1.1.26... OK
Running 'configure' for libxslt 1.1.26... OK
Running 'compile' for libxslt 1.1.26... OK
Running 'install' for libxslt 1.1.26... OK
Activating libxslt 1.1.26 (from /Users/micahsherman/.rvm/gems/ruby-1.9.3-p429/gems/nokogiri-1.6.0/ports/x86_64-apple-darwin13.0.0/libxslt/1.1.26)...
checking for libxml/parser.h... *** 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=/Users/micahsherman/.rvm/rubies/ruby-1.9.3-p429/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
/Users/micahsherman/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /Users/micahsherman/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:506:in `try_cpp'
from /Users/micahsherman/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:970:in `block in find_header'
from /Users/micahsherman/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:790:in `block in checking_for'
from /Users/micahsherman/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:284:in `block (2 levels) in postpone'
from /Users/micahsherman/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /Users/micahsherman/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:284:in `block in postpone'
from /Users/micahsherman/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /Users/micahsherman/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:280:in `postpone'
from /Users/micahsherman/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:789:in `checking_for'
from /Users/micahsherman/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:969:in `find_header'
from extconf.rb:166:in `<main>'
Gem files will remain installed in /Users/micahsherman/.rvm/gems/ruby-1.9.3-p429/gems/nokogiri-1.6.0 for inspection.
Results logged to /Users/micahsherman/.rvm/gems/ruby-1.9.3-p429/gems/nokogiri-1.6.0/ext/nokogiri/gem_make.out
I would appreciate some tips or advice. I am using Ruby 1.9.4, Rails 3.2.13 and I cannot figure out why this isn't working. I am using Mavericks and I thought that might be the problem.
I have updated xcode, etc.

Answer 1

This is not a direct solution but setting you up in the right direction. rvm is pretty solid at resolving its own issues. Follow these steps and help rvm do its magic
run rvm requirements to find what is missing.
use rvm pkg (on old version of rvm) or rvm autolibs to install missing packages.
Make sure you read all the documentation rvm asks you to read in this process.
Once done successfully, try installing nokogiri.