Reset build settings to default in Xcode?

Question

How do I reset build settings to default in Xcode?

Answer 1

To reset a single project setting so that it's no longer bold, select the option in the project settings and hit the delete key.

Answer 2

Sometimes, especially with multi-line items, hitting delete or cmd-delete does not work. For those items I just resort to setting the first line to $(inherited). This means the item is still bold, but it will otherwise have the correct value.