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我想下载Kibana，但不断收到此错误？任何想法..任何帮助将不胜感激！安装Kibana？有红宝石问题
Kibana-0.2.0$ sudo bundle install
Fetching gem metadata from http://rubygems.org/.........
Fetching gem metadata from http://rubygems.org/..
Resolving dependencies...
Installing rake (10.1.0)
Installing daemons (1.1.9)
Installing diff-lcs (1.1.3)
Installing eventmachine (1.0.0)
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/usr/bin/ruby1.9.1 extconf.rb
/usr/local/lib/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:45:in `require': cannot load such file -- mkmf (LoadError)
from /usr/local/lib/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:45:in `require'
from extconf.rb:2:in `<main>'
宝石文件仍将安装在/usr/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0进行检查。 结果记录到/usr/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0/ext/gem_make.out
在安装EventMachine的（1.0.0）发生了错误，和捆扎机不能 继续。 确保gem install eventmachine -v '1.0.0'成功绑定。