title: I get "xcrun: error: SDK "iphonesimulator" cannot be located" when running the toolchain
body: <p>I am trying to compile a Kivy program onto iOS, but when I run the command to build the Kivy distro I keep getting this error:</p>
  
  <blockquote>
    <p>xcrun: error: SDK "iphonesimulator" cannot be located</p>
  </blockquote>
  
  <p>I have xcode on my computer.  What is going on?</p>