在我运行的项目中，bundle install出现以下错误：
An error occurred while installing nokogiri (1.6.1), and Bundler cannot continue.
Make sure that `gem install nokogiri -v '1.6.1'` succeeds before bundling.
所以我尝试了
gem install nokogiri -v '1.6.1'
这确实有效。当然，现在这应该会让我感到高兴，但是我现在想知道，到底是什么使了窍门，所以我可以安装gem，现在bundle install也成功了。
我正在运行Mac OSX 10.9.2。
这是我第一次跑步时的日志 bundle install
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
/Users/me/.rvm/rubies/ruby-1.9.3-p545/bin/ruby extconf.rb --with-xml2-dir=/usr --with-xslt-dir=/opt/local --with-iconv-dir=/opt/local
Extracting libxml2-2.8.0.tar.gz into tmp/x86_64-apple-darwin13.1.0/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/me/.rvm/gems/ruby-1.9.3-p545/gems/nokogiri-1.6.1/ports/x86_64-apple-darwin13.1.0/libxml2/2.8.0)...
Extracting libxslt-1.1.26.tar.gz into tmp/x86_64-apple-darwin13.1.0/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/me/.rvm/gems/ruby-1.9.3-p545/gems/nokogiri-1.6.1/ports/x86_64-apple-darwin13.1.0/libxslt/1.1.26)...
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=/Users/me/.rvm/rubies/ruby-1.9.3-p545/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
--with-iconv-include
--without-iconv-include=${iconv-dir}/include
--with-iconv-lib
--without-iconv-lib=${iconv-dir}/lib
--with-xml2-dir
--with-xml2-include
--without-xml2-include=${xml2-dir}/include
--with-xml2-lib
--without-xml2-lib=${xml2-dir}/lib
--with-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
extconf failed, exit code 1
Gem files will remain installed in /Users/me/.rvm/gems/ruby-1.9.3-p545/gems/nokogiri-1.6.1 for inspection.
Results logged to /Users/me/.rvm/gems/ruby-1.9.3-p545/extensions/x86_64-darwin-13/1.9.1/nokogiri-1.6.1/gem_make.out
尝试这个：
brew install libxml2 libxslt libiconv
之所以无法安装它，bundle install是因为它bundler只能处理gem依赖关系，而不能处理本地依赖关系。gem需要您的系统拥有libxml2您没有的系统。因此，您需要安装它们。提示我答案的是您的日志中的此错误消息：
ERROR: Failed to build gem native extension.
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我来说两句