gl$ /usr/bin/xcodebuild -version -sdk
MacOSX10.8.sdk - OS X 10.8 (macosx10.8)
SDKVersion: 10.8
Path: /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk
PlatformVersion: 1.1
PlatformPath: /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform
ProductBuildVersion: 12F37
ProductCopyright: 1983-2013 Apple Inc.
ProductName: Mac OS X
ProductUserVisibleVersion: 10.8.5
ProductVersion: 10.8.5

MacOSX10.9.sdk - OS X 10.9 (macosx10.9)
SDKVersion: 10.9
Path: /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk
PlatformVersion: 1.1
PlatformPath: /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform
ProductBuildVersion: 13A595
ProductCopyright: 1983-2013 Apple Inc.
ProductName: Mac OS X
ProductUserVisibleVersion: 10.9
ProductVersion: 10.9

iPhoneOS7.0.sdk - iOS 7.0 (iphoneos7.0)
SDKVersion: 7.0
Path: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk
PlatformVersion: 7.0
PlatformPath: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform
ProductBuildVersion: 11B508
ProductCopyright: 1983-2013 Apple Inc.
ProductName: iPhone OS
ProductVersion: 7.0.3

iPhoneSimulator7.0.sdk - Simulator - iOS 7.0 (iphonesimulator7.0)
SDKVersion: 7.0
Path: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.0.sdk
PlatformPath: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform
ProductBuildVersion: 11B508
ProductCopyright: 1983-2013 Apple Inc.
ProductName: iPhone OS
ProductVersion: 7.0.3

Xcode 5.0.1
Build version 5A2053