title: HZ variable not defined
body: <p>I'm trying to compile someone's code right now and the person is using a variable HZ (which I think stands for Hertz for the hertz of the cpu) but the compiler is complaining that the variable is not defined. My guess is that the person didn't include the correct header file.</p>
  
  <p>So does anyone know which header file, HZ is defined in?</p>
  
  <p>Thanks</p>
  
  <p><strong>Edit:</strong> Compilation works on Debian g++ version 4.3.2 <br>
  The setup I'm using - OSX Leopard 10.5.8, g++ version 4.0.1 is where it fails.</p>