I can't find the good old "Add existing frameworks" option. How do I do this? We're talking about Xcode 4 DP2 (in the context of iPhone development, as far as it matters...).

In Xcode 4 DP2 and later versions, the process of adding existing frameworks has changed from previous versions. Instead of the "Add existing frameworks" option, you use the "Link Binary With Libraries" build phase to add frameworks to your project.

Here's how you can add existing frameworks in Xcode 4 DP2:

    Open your Xcode project.

    In the Project Navigator on the left-hand side, select your project (the top-level item).

    Select the target you want to add the framework to. This is usually your application target under the "Targets" section.

    Go to the "Build Phases" tab.

    Under the "Link Binary With Libraries" section, click the "+" button to add a new framework.

    A list of available frameworks will appear. You can either search for the framework you want to add or scroll through the list.

    Select the framework you want to add, and then click the "Add" button.

Here's a step-by-step example using Xcode 4 DP2 to add the UIKit.framework:

    Open your Xcode project.

    In the Project Navigator, select your project.

    Under the "Targets" section, select your application target.

    Go to the "Build Phases" tab.

    Under the "Link Binary With Libraries" section, click the "+" button.

    Search for "UIKit" in the search bar, or scroll down and find "UIKit.framework."

    Select "UIKit.framework" and click the "Add" button.

    You will see "UIKit.framework" added to the list of linked frameworks.

Remember that Xcode's interface and features can change with different versions, so there might be some variations in newer versions. However, the process of adding frameworks using the "Link Binary With Libraries" build phase remains relatively consistent across versions.