我需要安装 JSON gem 来启动我的应用程序，但每当我尝试安装 json gem 时都会收到以下错误。谁能帮我吗。我正在使用 rails 2.2.2 和 gems 1.3.1。

Arions-macbook-pro:.ssh arion$ sudo gem install json
Password:
Sorry, try again.
Password:
Building native extensions.  This could take a while...
ERROR:  Error installing json:
    ERROR: Failed to build gem native extension.

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb install json
can't find header files for ruby.


Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/json-1.1.4 for inspection.
Results logged to /Library/Ruby/Gems/1.8/gems/json-1.1.4/ext/json/ext/parser/gem_make.out

最佳答案

使用 Mavericks，您可以通过从命令行安装 Xcode 命令行工具来解决此问题，如下所示:

xcode-select --install

更新: 安装或更新后不要忘记接受许可协议(protocol):

sudo xcodebuild -license

https://stackoverflow.com/questions/761521/