title: git clone does not compile (undefined symbol _clock_gettime_nsec_np) Google VR SDK
body: <p>I am getting below error after pod update in Google VR Sdk</p>
  
  <blockquote>
    <p>Undefined symbols for architecture x86_64:</p>
    
    <p>"_clock_gettime_nsec_np", referenced from:</p>
    
    <p>base::GetCurrentTimeNanos() in libGVRSDK.a(get_current_time.o)</p>
    
    <p>ld: symbol(s) not found for architecture x86_64</p>
    
    <p>clang: error: linker command failed with exit code 1 (use -v to see
    invocation)</p>
  </blockquote>