使用CocoaPods时遇到 Permission denied 问题

报错：

Setting up CocoaPods master repo
[!] /usr/bin/git clone 'https://github.com/CocoaPods/Specs.git' master --depth=1
fatal: could not create work tree dir 'master'.: Permission denied
/Library/Ruby/Gems/2.0.0/gems/claide-0.6.1/lib/claide/command.rb:304:in `handle_exception': undefined method `verbose?' for nil:NilClass (NoMethodError)
from /Library/Ruby/Gems/2.0.0/gems/claide-0.6.1/lib/claide/command.rb:284:in `rescue in run'
from /Library/Ruby/Gems/2.0.0/gems/claide-0.6.1/lib/claide/command.rb:274:in `run'
from /Library/Ruby/Gems/2.0.0/gems/cocoapods-0.33.1/lib/cocoapods/command.rb:48:in `run'
from /Library/Ruby/Gems/2.0.0/gems/cocoapods-0.33.1/bin/pod:33:in `<top (required)>'
from /usr/bin/pod:23:in `load'
from /usr/bin/pod:23:in `<main>'

 

解决网址：

http://www.v2ex.com/t/113547