安裝滑軌

Question

我嘗試在終端中使用以下命令在OS X Lion上安裝Rails：

sudo gem install rails

但是我收到以下錯誤：

    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

任何幫助，將不勝感激。

Answer 1

首先在最新的Xcode-Version安裝命令行工具。

然后運行sudo gem install rails

要安裝命令行工具，請轉到XCode首選項>下載。