ERROR: Error installing json:The 'json' native gem requires installed build tools.
C:\ruby\blog>gem install json -v '1.8.3'
ERROR: Error installing json: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'
在 windows下搭建Ruby Rails Web开发环境 时遇到这个问题，
发生这个错误的原因是没有安装DevKit
DevKit
加上devkit之后，你的ruby中便具有了一个mingw32的本地编译环境，而且这个本地编译环境是自动调用的。只有在你要安装的gem需要本地编译时，才会调用devkit。
http://rubyinstaller.org/add-ons/devkit
下载DevKit
http://rubyinstaller.org/downloads
安装DevKit
1、运行，解压到一个目录，例如：C:\DevKit
2、打开命令行，切换到这个目录；
3、执行命令：ruby dk.rb init
4、修改config.yml文件
- # This configuration file contains the absolute path locations of all
- # installed Rubies to be enhanced to work with the DevKit. This config
- # file is generated by the 'ruby dk.rb init' step and may be modified
- # before running the 'ruby dk.rb install' step. To include any installed
- # Rubies that were not automagically discovered, simply add a line below
- # the triple hyphens with the absolute path to the Ruby root directory.
- #
- # Example:
- #
- # ---
- - C:\Ruby22-x64
- # - C:/ruby192dev
- #
- ---
- C:\Ruby22-x64 是我的Ruby安装目录
5、执行命令：ruby dk.rb install
- C:\DevKit>ruby dk.rb install
- [INFO] Updating conve
安装完DevKit之后，再执行命令安装JSON包：gem install json -v '1.8.3'
安装过程中可能会出现以下问题：
C:\ruby\blog>gem install json -v '1.8.3'
ERROR: While executing gem ... (Gem::RemoteFetcher::FetchError)
Errno::ECONNABORTED: An established connection was aborted by the software i
n your host machine. - SSL_connect (https://api.rubygems.org/quick/Marshal.4.8/json-1.8.3.gemspec.rz)
这可能是由于网络的原因，多试几次就好了。
https://github.com/oneclick/rubyinstaller/wiki/Development-Kit
