成功执行完sudo gem install bundler后继续执行sudo bundle install出错，提示如下：
Fetching gem metadata from http://rubygems.org/.......
Fetching additional metadata from http://rubygems.org/..
Resolving dependencies...
Using rake (0.9.2.2)
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
4
663 /usr/bin/ruby1.9.1 extconf.rb
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in require': cannot load such file -- mkmf (LoadError)
from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:inrequire'
from extconf.rb:1:in `
Gem files will remain installed in /var/lib/gems/1.9.1/gems/RedCloth-4.2.9 for inspection.
Results logged to /var/lib/gems/1.9.1/gems/RedCloth-4.2.9/ext/redcloth_scan/gem_make.out
An error occurred while installing RedCloth (4.2.9), and Bundler cannot continue.
Make sure that gem install RedCloth -v '4.2.9' succeeds before bundling.
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推荐使用rvm或者rbenv安装ruby, 并且避免使用sudo.
所以就按照提示
sudo gem install RedCloth -v '4.2.9'应该就可以了你通过什么方式安装的ruby？检查一下ruby 的 dev 开发依赖有没有装上