title: Xcode how do i know which version of the OS i'm building for?
body: <p>I'm trying to figure out what version of the OS I'm building for, i.e. 6.0, 6.1, 7.1.  All the variables in the environment either point to the base version or the latest SDK version.  So if I set to build the 6.1 simulator, and my deployment target is 6.0 and the base SDK version is 7.1, this is all I see in the build environment:</p>
  
  <pre><code>    SDKROOT=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.1.sdk
  SDK_NAME=iphonesimulator7.1
  PLATFORM_VERSION_AVAILABILITY_H_FORMAT=70100
  SDK_DIR=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.1.sdk
  IPHONEOS_DEPLOYMENT_TARGET=6.0`enter code here`
  </code></pre>
  
  <p>There is nothing there at all to indicate that I'm building for 6.1</p>
  
  <p>So how do I figure this out?</p>