You can use the iOS 6 SDK on XCode 5.
For that you need to have XCode 4 and XCode 5 on your Mac.
1/ In terminal :
cd /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs
2/ Create a symbolic link in this folder to the older SDK
for example for me :
sudo ln -s /Applications/Xcode4/Xcode4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk ./iPhoneOS6.1.sdk
3/ Go to the Project settings and chose your SDK
4/ Do only that for iPhoneOS. The support for the simulator need to be done from the XCode Preference menu
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