title: an error "No architectures to compile for (ONLY_ACTIVE_ARCH=YES, active arch=x86_64, VALID_ARCHS=armv7 armv7s)."?
body: <p>I have Xcode 4.6. I downloaded <a href="https://github.com/nikolaypavlov/MLPNeuralNet">this project</a> When run it i receive a message
  <code>No architectures to compile for (ONLY_ACTIVE_ARCH=YES, active arch=x86_64, VALID_ARCHS=armv7 armv7s).</code> 
  Where and what i have to change? I have no idea what should i do? Thanx</p>