ruby-on-rails-3 - gem install json -v 1.7.3提供了 'Please update your PATH to include build tools'

当我跑步时:

rails new blog

我得到:

Installing json (1.7.3)
Gem::InstallError: The 'json' native gem requires installed build tools.

Please update your PATH to include build tools or download the DevKit
from 'http://rubyinstaller.org/downloads' and follow the instructions
at 'http://github.com/oneclick/rubyinstaller/wiki/Development-Kit'
An error occurred while installing json (1.7.3), and Bundler cannot continue.
Make sure that `gem install json -v '1.7.3'` succeeds before bundling.

当我跑步时:

gem install json -v 1.7.3

我得到:

Please update your PATH to include build tools or download the DevKit
from 'http://rubyinstaller.org/downloads' and follow the instructions
at 'http://github.com/oneclick/rubyinstaller/wiki/Development-Kit'

我正在使用Windows8。我的路径中确实有c:\ruby193\bin。我该如何解决这些错误？

最佳答案

确保安装devkit(选中将更新路径的复选框):
您可能还需要重新安装ruby。
安装DevKit
从这里下载开发套件http://rubyinstaller.org/downloads/
目前的DevKit网址适用于Ruby 1.8.7和1.9.3:DevKit-tdm-32-4.5.2
适用于Ruby 2.0及更高版本(仅限32位版本):
DevKit-mingw64-32-4.7.2
适用于Ruby 2.0及更高版本(仅x64-64位)
DevKit-mingw64-64-4.7.2
按照here的指示进行操作。
或简短说明: