title: Differences between "empty project" and "external build system" in XCode
body: <p>I am new in the programming world, and use XCode's IDE and compiler (GCC?) to program. But I have a questions, what is the differences between "empty project" and "external build system" in XCode?</p>
  
  <p>It's sounds like a stupid question, but why not ask? :)</p>