无法安装JSON Gem（Windows）

Question

每次尝试更新或安装JSON gem时，都会出现构建错误。 这些是输出文件中的结果：

c:/Ruby193/bin/ruby.exe extconf.rb 
creating Makefile

make
generating parser-i386-mingw32.def
compiling parser.c
In file included from c:/Ruby193/include/ruby-1.9.1/ruby/ruby.h:1360,
                 from c:/Ruby193/include/ruby-1.9.1/ruby.h:32,
                 from ../fbuffer/fbuffer.h:6,
                 from parser.rl:1:
c:/Ruby193/include/ruby-1.9.1/ruby/missing.h:41: error: redefinition of 'struct timespec'
c:/Ruby193/include/ruby-1.9.1/ruby/missing.h:48: error: redefinition of 'struct timezone'
make: *** [parser.o] Error 1

我开始学习Rails，在继续之前我想弄清楚这一点。

---

这是生成的默认Gemfile：

source 'http://rubygems.org'

gem 'rails', '3.1.3'

# Bundle edge Rails instead:
# gem 'rails',     :git => 'git://github.com/rails/rails.git'

gem 'sqlite3'


# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails',   '~> 3.1.5'
  gem 'coffee-rails', '~> 3.1.1'
  gem 'uglifier', '>= 1.0.3'
end

gem 'jquery-rails'

# To use ActiveModel has_secure_password
# gem 'bcrypt-ruby', '~> 3.0.0'

# Use unicorn as the web server
# gem 'unicorn'

# Deploy with Capistrano
# gem 'capistrano'

# To use debugger
# gem 'ruby-debug19', :require => 'ruby-debug'

group :test do
  # Pretty printed test output
  gem 'turn', '~> 0.8.3', :require => false
end

Answer 1

要构建需要本机构建工具的Gems，请确保已安装DevKit 。 链接中提供了说明。

您能否添加gem install json或相应命令的结果？

Answer 2

这是一个老问题，但是对我有用 ： https : //github.com/oneclick/rubyinstaller/wiki/Troubleshooting#gems_fails_comspec_autorun

具体情况B

REG QUERY "HKCU\Software\Microsoft\Command Processor" /s

如果收到“ AUTORUN”响应，请按以下步骤将其删除：

REG DELETE "HKCU\Software\Microsoft\Command Processor" /v AutoRun

Answer 3

如果这仅是本地的，则始终可以采用简单的方法，而可以用gem install json_pure （100％Ruby实现，速度很慢，但可以运行）