Error installing Nokogiri gem on Mac OS X - ruby

Question

I was trying to install a connector for Rally and bugzilla on my Mac OSx. While running the install script, it tries to install the gems and it looks for the libxml2 which is already present on my machine.
This happens when it tries to install nokogiri.
This is the transcript:
Building native extensions with: '--use-system-libraries'
This could take a while...
ERROR: Error installing nokogiri:
ERROR: Failed to build gem native extension.
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby -r ./siteconf20150121-48754-wgouyu.rb extconf.rb --use-system-libraries
Extracting libxml2-2.8.0.tar.gz into tmp/x86_64-apple-darwin13.4.0/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 /Library/Ruby/Gems/2.0.0/gems/nokogiri-1.6.1/ports/x86_64-apple-darwin13.4.0/libxml2/2.8.0)...
Extracting libxslt-1.1.26.tar.gz into tmp/x86_64-apple-darwin13.4.0/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 /Library/Ruby/Gems/2.0.0/gems/nokogiri-1.6.1/ports/x86_64-apple-darwin13.4.0/libxslt/1.1.26)...
checking for libxml/parser.h... yes
checking for libxslt/xslt.h... yes
checking for libexslt/exslt.h... yes
checking for iconv_open() in iconv.h... no
checking for iconv_open() in -liconv... yes
checking for xmlParseDoc() in -lxml2... 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
--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=/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/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-pkg-config
--without-pkg-config
--with-libiconv-config
--without-libiconv-config
--with-pkg-config
--without-pkg-config
--with-iconvlib
--without-iconvlib
--with-xml2lib
--without-xml2lib
extconf failed, exit code 1
Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/nokogiri-1.6.1 for inspection.
Results logged to /Library/Ruby/Gems/2.0.0/extensions/universal-darwin-13/2.0.0/nokogiri-1.6.1/gem_make.out
I tried so many options like installing the command line tools by running the below command.
xcode-select --install
Adding the symbolic links to gcc compliler
sudo ln -s /usr/bin/llvm-gcc /usr/bin/gcc-4.2
I have been struggling for the past two days. Any help is highly apperciated.

Answer 1

If you are using brew use this in the terminal:
brew unlink gcc-4.2 # you might not need this step
gem uninstall nokogiri
xcode-select --install
gem install nokogiri
If this didn't work please check "Installing Nokogiri on OSX 10.10 Yosemite"

Answer 2

Solved the issue with the command
sudo ARCHFLAGS="-arch x86_64" gem install nokogiri -v '1.6.1'
thanks for the link pointed out by mohamed abd.

Answer 3

This worked for me:
sudo gem install nokogiri --no-rdoc --no-ri