title: xcode5: Apple LLVM 5.1 error when building
body: <p>If I'll run my app on the iOS-Simulator this error comes up:</p>
  
  <pre><code>fatal error: file '/Users/Patti/Desktop/Picxxr/Picxxr/Picxxr-Prefix.pch' has been modified since the precompiled header '/Users/Patti/Library/Developer/Xcode/DerivedData/Picxxr-gcakojkodoomqcertyparosqruxs/Build/Intermediates/PrecompiledHeaders/Picxxr-Prefix-dpxcuqgwybsqepgyjnhyqvzeyjhk/Picxxr-Prefix.pch.pch' was built
  </code></pre>
  
  <p>Does somebody knows why?</p>