Xcode compiling for a lower version iOS

I have just upgraded my iOS sdk to the latest version 3.2.5 and I found that I can't i开发者_Go百科nstall my app on my iPhone 4.1. Is there a way that I can compile my program for the old iOS or do I need to upgrade my iPhone to 4.2?

Thanks.

If you had the 4.1 sdk earlier, you can set the deployment target for your app in Project->Edit Active Target->Build. Choose the "iOS Deployment Target" and set 4.1 there.

In Xcode 4, set your target in the project settings like this: