我正在尝试安装和使用Nokogiri来测试一些东西。我没有使用rails，只是简单的ruby，我尝试在终端中运行gem install nokogiri。
我得到的错误是
libiconv is missing. please visit http://nokogiri.org/tutorials/installing_nokogiri.html for help with installing dependencies.
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*** 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.
Gem files will remain installed in /Users/test/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/nokogiri-1.6.3.1 for inspection.
Results logged to /Users/Wilson/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/extensions/x86_64-darwin-13/2.1.0-static/nokogiri-1.6.3.1/gem_make.out
是因为rbenv吗？有人有解决方案吗？