I know this answer is answered and closed, but I’m going to add my discoveries here as it is slightly different for Xcode 4.2:
- Select your project
- In the left side of the middle pane, select your app under “Targets”
- Select the tab “Build Settings”
- Search the following keywords: “info.plist” and “pch”
- At this point it should be pretty clear which are the ones you need to modify.
- Click on “Validate Settings” and you’re done.