Disable garbage collection support.
Declare a dummy prototype for __dummyAction to quiet warnings from clang about undefined selector.
Quiet warnings about alpha constants passed to CGBitmapContextCreate. They are documented as being safe, so just cast them to quiet the warning.
scanHexInt takes an unsigned int pointer. Even though it's ignored, fix the typing to avoid a compiler error (and possible NULL reference?).
Declare a method prototype for a less formal delegate method that is relied upon by IMBNodeViewController. Quiets a warning about an unrecognized @selector.
Remove wiring to evidently obsolete showPopover: method. I believe whatever conveyance of information that was being achieved by this is now happening through other channels.
Update to recommended settings
ObjectiveFlickr: Remove garbage collection support
XPCKit: Update partly to recommended project settings

Excluded building for active architecture only