Mac：OS X Mavericks 10.9.2 Ruby：2.1.2
我正在尝试为rails安装nokogiri，并在构建打包库时遇到错误。 libiconv丢失，我转到错误消息中给出的installation page，但遇到警告消息，我不确定该怎么做。
以下是我运行bundle时的结果：
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
/Users/user/.rvm/rubies/ruby-2.1.2/bin/ruby extconf.rb
Building nokogiri using packaged libraries.
-----
libiconv 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=/Users/user/.rvm/rubies/ruby-2.1.2/bin/ruby
--help
--clean
--use-system-libraries
--enable-static
--disable-static
--with-zlib-dir
--without-zlib-dir
--with-zlib-include
--without-zlib-include=${zlib-dir}/include
--with-zlib-lib
--without-zlib-lib=${zlib-dir}/lib
--enable-cross-build
--disable-cross-build
extconf failed, exit code 1
Gem files will remain installed in /Users/user/.rvm/gems/ruby-2.1.2@campus-taps-master/gems/nokogiri-1.6.3.1 for inspection.
Results logged to /Users/user/.rvm/gems/ruby-2.1.2@campus-taps-master/extensions/x86_64-darwin-13/2.1.0-static/nokogiri-1.6.3.1/gem_make.out
An error occurred while installing nokogiri (1.6.3.1), and Bundler cannot
continue.
Make sure that `gem install nokogiri -v '1.6.3.1'` succeeds before bundling.
然后我按照说明运行brew install libxml2 libxslt并且很好，但是当我运行brew link libxml2 libxslt时。我收到这两条警告信息：
Warning: libxml2 is keg-only and must be linked with --force
Note that doing so can interfere with building software.
Warning: libxslt is keg-only and must be linked with --force
Note that doing so can interfere with building software.
我不知道该怎么办，也不想弄乱我的系统。