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Solution. Uninstall all versions of Nokogiri on your system, and then re-resolve your dependencies (using bundle or gem install ). This error can occur when a version of Nokogiri installed for a different version of Ruby is used by an unsupported version of Ruby.
The Nokogiri gem is an incredible open-source tool that parses HTML and XML data. It is one of the most widely used gems available, and it can really take your Ruby app to another level for data with its ability to help you intuitively scrape websites.
Imagine a tool and you most probably have it in your Ruby kit. One of the best gems for Ruby on Rails is Nokogiri which is a library to deal with XML and HTML documents. The most common use for a parser like Nokogiri is to extract data from structured documents.
Nokogiri (htpp://nokogiri.org/) is the most popular open source Ruby gem for HTML and XML parsing. It parses HTML and XML documents into node sets and allows for searching with CSS3 and XPath selectors. It may also be used to construct new HTML and XML objects.
I updated to the developer release of Lion and noticed I couldn't start rails apps anymore. Whenever I try to sudo bundle install, I get the following error:
Installing nokogiri (1.4.4) with native extensions /Library/Ruby/Site/1.8/rubygems/installer.rb:551:in `build_extensions': ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb
mkmf.rb can't find header files for ruby at /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/ruby.h
Gem files will remain installed in /Users/jamielawrence/Documents/Websites/atgdb/vendor/bundle/ruby/1.8/gems/nokogiri-1.4.4 for inspection.
Results logged to /Users/jamielawrence/Documents/Websites/atgdb/vendor/bundle/ruby/1.8/gems/nokogiri-1.4.4/ext/nokogiri/gem_make.out
from /Library/Ruby/Site/1.8/rubygems/installer.rb:504:in `each'
from /Library/Ruby/Site/1.8/rubygems/installer.rb:504:in `build_extensions'
from /Library/Ruby/Site/1.8/rubygems/installer.rb:180:in `install'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/source.rb:101:in `install'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/rubygems_integration.rb:78:in `preserve_paths'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/source.rb:91:in `install'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/installer.rb:58:in `run'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/rubygems_integration.rb:93:in `with_build_args'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/installer.rb:57:in `run'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/spec_set.rb:12:in `each'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/spec_set.rb:12:in `each'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/installer.rb:49:in `run'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/installer.rb:8:in `install'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/cli.rb:222:in `install'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/vendor/thor/task.rb:22:in `send'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/vendor/thor/task.rb:22:in `run'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/vendor/thor/invocation.rb:118:in `invoke_task'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/vendor/thor.rb:246:in `dispatch'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/lib/bundler/vendor/thor/base.rb:389:in `start'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.15/bin/bundle:13
from /usr/bin/bundle:19:in `load'
from /usr/bin/bundle:19
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