安装滑轨

Question

我尝试在终端中使用以下命令在OS X Lion上安装Rails：

sudo gem install rails

但是我收到以下错误：

    Building native extensions.  This could take a while...
    ERROR:  Error installing rails:
ERROR: Failed to build gem native extension.

   /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb
    mkmf.rb can't find header files for ruby at /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/ruby.h


 Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/json-1.7.6 for inspection.
  Results logged to /Library/Ruby/Gems/1.8/gems/json-1.7.6/ext/json/ext/generator/gem_make.out

任何帮助，将不胜感激。

Answer 1

首先在最新的Xcode-Version安装命令行工具。

然后运行sudo gem install rails

要安装命令行工具，请转到XCode首选项>下载。