Ruby on rails 错误：安装rails错误：无法生成gem本机扩展

我在尝试安装Rails时遇到以下错误：

    Z:\AlexL\My Documents\rails>gem install rails
ERROR:  Error installing rails:
        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'

Z:\AlexL\My Documents\rails>gem install rails -include-dependencies
ERROR:  Error installing rails:
        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'
ERROR:  While executing gem ... (URI::InvalidURIError)
    bad URI(is not URI?): ?gems=ûinclude-dependencies

Z:\AlexL\My Documents\rails>rails
'rails' is not recognized as an internal or external command,
operable program or batch file.

我的Ruby版本是：

ruby 1.9.3p484

---

我怎样才能解决这个问题？顺便说一句，我在windows上。

您收到的错误消息清楚地说明：

请更新路径以包含构建工具或下载DevKit 从“”开始，然后按照说明进行操作 在“

---

因此，我建议您下载DevKit并按照说明进行操作。

请粘贴完整的堆栈跟踪，然后更新ruby的

PATH

环境变量以查找二进制文件。。