title: How to fix sleep on objective C sdk 4.0?
body: <p>I have a warning on objective c for iphone
  it says "implicit declaration of function 'sleep'"</p>
  
  <p>All I have is a sleep(1); for the splash in the applicationDidFinishLaunching</p>
  
  <p>I didn't have this problem in prior versions of the sdk</p>
  
  <p>I know is just a warning, but I had problems before with apple for not having 100% success</p>
  
  <p>Thanks for everything :D</p>