You can still create a duplicate target and manually link the libFrank.a (and other dependent static libraries). That way you can build the Frank target from within Xcode.
It looks like an issue with HEADER_SEARCH_PATHS and/or USER_HEADER_SEARCH_PATHS. Is there a stripped down version you could put on github to have a look at?
Right where you get the failure finding MyView.h, xcodebuild will have output a massive line of code with all the compiler flags. If you look at the list of header directories to have a look at, you might see if it's missing the path to MyView.h (and compare with running xcodebuild without Frank enabled).
- Stew