I got the error like this:
Xcode version: 4.6.3 target: iphone 5
Undefined symbols for architecture armv7:
"_OBJC_CLASS_$_OFFlickrAPIContext", referenced from:
objc-class-ref in AppDelegate.o
"_OBJC_CLASS_$_OFFlickrAPIRequest", referenced from:
objc-class-ref in AppDelegate.o
objc-class-ref in SharingViewController.o
"_OFFlickrWritePermission", referenced from:
-[SharingViewController flickrAPIRequest:didObtainOAuthRequestToken:secret:] in SharingViewController.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
The objective flickr library is generated.