In Xcode 4, you first click on the project itself to get to the project editor.
(like is shown in the screenshot here)
Then you need to go to build settings and change the Base SDK setting (and all its child variants) to an SDK you actually have on your system.
Here's a movie that shows how to edit build settings:
You will also need to do this for the AMSProgressBar child project. In Xcode 4, rather than opening that project separately, it also shows up in the file outline for Bricksmith.
Allen
(like is shown in the screenshot here)
Then you need to go to build settings and change the Base SDK setting (and all its child variants) to an SDK you actually have on your system.
Here's a movie that shows how to edit build settings:
You will also need to do this for the AMSProgressBar child project. In Xcode 4, rather than opening that project separately, it also shows up in the file outline for Bricksmith.
Allen