Nokogiri issues with Ruby on Rails - ruby-on-rails

Question

I'm trying to install nokogiri on my machine but I am receiving the following error:
Building native extensions. This could take a while...
ERROR: Error installing nokogiri:
ERROR: Failed to build gem native extension.
current directory: /Users/username/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/nokogiri-1.6.6.4/ext/nokogiri
/Users/username/.rbenv/versions/2.0.0-p481/bin/ruby -r ./siteconf20151127-29540-11ahx4h.rb extconf.rb
checking if the C compiler accepts ... *** 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=/Users/username/.rbenv/versions/2.0.0-p481/bin/ruby
--help
--clean
/Users/username/.rbenv/versions/2.0.0-p481/lib/ruby/2.0.0/mkmf.rb:434:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /Users/username/.rbenv/versions/2.0.0-p481/lib/ruby/2.0.0/mkmf.rb:549:in `block in try_compile'
from /Users/username/.rbenv/versions/2.0.0-p481/lib/ruby/2.0.0/mkmf.rb:500:in `with_werror'
from /Users/username/.rbenv/versions/2.0.0-p481/lib/ruby/2.0.0/mkmf.rb:549:in `try_compile'
from extconf.rb:80:in `nokogiri_try_compile'
from extconf.rb:87:in `block in add_cflags'
from /Users/username/.rbenv/versions/2.0.0-p481/lib/ruby/2.0.0/mkmf.rb:599:in `with_cflags'
from extconf.rb:86:in `add_cflags'
from extconf.rb:337:in `<main>'
To see why this extension failed to compile, please check the mkmf.log which can be found here:
/Users/username/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/extensions/x86_64-darwin-14/2.0.0-static/nokogiri-1.6.6.4/mkmf.log
extconf failed, exit code 1
Gem files will remain installed in /Users/username/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/nokogiri-1.6.6.4 for inspection.
Results logged to /Users/username/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/extensions/x86_64-darwin-14/2.0.0-static/nokogiri-1.6.6.4/gem_make.out
I'm unsure how to go about fixing this as I do not have too much experience with setting up native extensions. Any help would be greatly appreciated. Let me know if more information needs to be presented.

Answer 1

This seems to be a common issue. You can check the following link
http://www.nokogiri.org/tutorials/installing_nokogiri.html
You will need to update the Rubygems to 2.4.5 or later and also check whether development tools is installed on you pc.
Or you can do the following if you are using bundle
gem update --system
gem install nokogiri -- --use-system-libraries
bundle config build.nokogiri --use-system-libraries
bundle install

Answer 2

I had to use version 1.6.7.rc4-x64-mingw32 (I'm on Windows). Added this line to my Gemfile:
gem 'nokogiri', '~> 1.6', '>= 1.6.7.rc4'

Answer 3

After combining many solutions from git issues and SO, this worked for me:
gem install nokogiri -v '1.6.7' -n /usr/local/bin -- --use-system-libraries --with-xml2-include=/usr/include/libxml2 --with-xml2-lib=/usr/lib/
Although I did prepend sudo.