I'm putting MapKit into my iPhone/iPad app, and the link stage is giving me an 
error I don't understand. When I direct it to the Simulator all is well. When I 
choose the Device I get a link error,

"_OBJC_CLASS_$_MKMapView", referenced from:
objc-class-ref-to-MKMapView in MapViewController.o
ld: symbol(s) not found
collect2: ld returned 1 exit status



The offending code is this line,

    mapView = [[MKMapView alloc] initWithFrame:screenRect];

If I remove it, there is no link error (and no map either, of course).

I'm sure I am using compatible SDKs, and the Simulator links and runs as I 
expect.  Does anyone recognize this?

David

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