ubuntu 安装rails

1.安装ruby

2.安装rails

sudo gem install rails -V

增加-V参数可看到安装过程

ERROR:  Error installing rails:
ERROR: Failed to build gem native extension.
/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

报错，安装ruby19.1-dev

再次安装rails