I have two Xcode projects: `Super` and `Sub`. `Super` has a custom configuration: `Enterprise`. `Sub` only has the default configurations: `Debug` and `Release`. `Super` has a target dependency on `Sub`. When I build `Super` with the `Enterprise` configuration, `Sub` builds with its default configuration: `Release`. This yields the following hierarchy:

```
Build
|-Products
  |-Enterprise-iphoneos
    |-Super.app
  |-Release-iphoneos
    |-libSub.a
    |-Sub
      |-Sub.h

```

Clang fails to build because `libSub.a` and `Sub/Sub.h` is normally in the same directory as `Super.app`, but instead is in a different directory because `Sub` built with the `Release` configuration instead of `Enterprise`. I control both projects, so I could easily add an `Enterprise` configuration to `Sub`, but I feel like there must be a magical incantation of [Xcode Build Settings](https://developer.apple.com/library/mac/#documentation/DeveloperTools/Reference/XcodeBuildSettingRef/1-Build_Setting_Reference/build_setting_ref.html) to make this work.