在mac上安装cocoapods失败

我试图按照http://cocoapods.org/的说明在mac上安装cocoapods，但是得到了如下错误：

$sudo gem install cocoapods ERROR: While executing gem ... (Gem::RemoteFetcher::FetchError) bad response Service Unavailable: Back-end server is at capacity 503 (https://api.rubygems.org/api/v1/dependencies?gems=cocoapods) 

但有时，错误信息是不同的。

 $ sudo gem install cocoapods Password: Building native extensions. This could take a while... ERROR: Error installing cocoapods: ERROR: Failed to build gem native extension. rake RUBYARCHDIR=/Users/tap4fun/.rvm/rubies/ruby-1.9.3-p484/lib/ruby/gems/1.9.1/extensions/x86_64-darwin-12/1.9.1/xcodeproj-0.17.0 RUBYLIBDIR=/Users/tap4fun/.rvm/rubies/ruby-1.9.3-p484/lib/ruby/gems/1.9.1/extensions/x86_64-darwin-12/1.9.1/xcodeproj-0.17.0/Users/tap4fun/.rvm/rubies/ruby-1.9.3-p484/lib/ruby/site_ruby/1.9.1/rubygems/dependency.rb:298:in `to_specs': Could not find 'rake' (>= 0) among 20 total gem(s) (Gem::LoadError) from /Users/tap4fun/.rvm/rubies/ruby-1.9.3-p484/lib/ruby/site_ruby/1.9.1/rubygems/dependency.rb:309:in `to_spec' from /Users/tap4fun/.rvm/rubies/ruby-1.9.3-p484/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_gem.rb:53:in `gem' from /Users/tap4fun/.rvm/gems/ruby-1.9.3-p484/bin/rake:22:in `' from /Users/tap4fun/.rvm/gems/ruby-1.9.3-p484/bin/ruby_executable_hooks:15:in `eval' from /Users/tap4fun/.rvm/gems/ruby-1.9.3-p484/bin/ruby_executable_hooks:15:in `' rake failed, exit code 1 Gem files will remain installed in /Users/tap4fun/.rvm/rubies/ruby-1.9.3- p484/lib/ruby/gems/1.9.1/gems/xcodeproj-0.17.0 for inspection. Results logged to /Users/tap4fun/.rvm/rubies/ruby-1.9.3-p484/lib/ruby/gems/1.9.1/extensions/x86_64-darwin-12/1.9.1/xcodeproj-0.17.0/gem_make.out 

ruby版本：1.9.3

rake版本：10.2.2

Answer 1

试试这个（为OSX 10.10工作）

1. 打开Xcode 6
2. 打开首选项
3. 单击“位置”选项卡
4. 将命令行工具版本更改为Xcode 6.0

5. 卸载cocoapods

   $ sudo gem uninstall cocoapods

6. 安装xcodeproj

   $ sudo gem install xcodeproj

7. 安装cocoapods

   $ sudo gem install cocoapods

运行pod --version来validation