title: No member named 'clock' in the global namespace when using FFmpeg pod
body: <p>My app (iOS 7+, Xcode 6) uses CocoaPods for its dependencies. One of the dependencies is <a href="https://github.com/FFmpeg/FFmpeg" rel="noreferrer">FFmpeg</a>.</p>
  
  <p>When I build my app I get several similar looking issues like </p>
  
  <blockquote>
    <p>/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/ctime:60:9:
    No member named 'clock' in the global namespace; did you mean 'flock'?</p>
  </blockquote>
  
  <p>I learned that this is because FFmpeg includes <code>time.h</code> file in <code>libavutil</code> subfolder. This <code>time.h</code> hides system <code>time.h</code> from the compiler and thus the errors.</p>
  
  <p>I tried to manually rename FFmpeg's time.h to something else and <em>this helps</em>. Now I want to do that automatically and in a way that will survive next 'pod update'.</p>
  
  <p>I tried to add libavutil to <code>Sub-Directories to Exclude In Recursive Searches</code> but this doesn't help at all.</p>
  
  <p>I tried to remove "${PODS_ROOT}/Headers/Public/FFmpeg/libavutil" from <code>Header Search Paths</code> and it didn't help either.</p>
  
  <p>I know there are <code>prepare_command</code> and <code>post_install</code> hooks one can use in his Podfile but unfortunately I don't know if these are helpful in my case.</p>
  
  <p>So, how can I exclude time.h in libavutil of FFmpeg pod from header search paths (I don't mind to rename or even remove the time.h)?</p>