title: Can not perform `pod install` under el capitan (15A279b)
body: <p>I ran <code>pod install</code> with El Capitan and got this error:</p>
  
  <pre><code>Errno::EPERM - Operation not permitted - /Users/../Pods/Pods.xcodeproj/xcuserdata/root.xcuserdatad
  </code></pre>
  
  <p>Here's my environment: El Capitan (15A279b), Xcode Version 7.0 (7A220), cocoapod 0.38.2.  Any ideas?  Thanks!!!</p>
  
  <p>The reason I use xcode7 (and not 6.4) is that I need to target an existing project to iOS9 for testing.  And the reason I am using El Capitan is that xcode7 doesn't run under Yosemite.  And I need to replace a library (managed by cocoapod) that no longer works under iOS9. </p>
  
  <p>Here's how I install cocoapods in El Capitan
  <code>sudo gem install -n /usr/local/bin cocoapods</code>
  as suggested by this link <a href="https://stackoverflow.com/questions/30812777/cannot-install-cocoa-pods-after-uninstalling-results-in-error/30851030#30851030">Cannot install cocoa pods after uninstalling, results in error</a></p>
  
  <p><code>pod --version</code></p>
  
  <p>returns</p>
  
  <p><code>0.38.2</code></p>