Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_JSQMessage", referenced from:
  objc-class-ref in ChatView.o
  "_OBJC_CLASS_$_JSQMessagesAvatarImageFactory", referenced from:
  objc-class-ref in ChatView.o
  "_OBJC_CLASS_$_JSQMessagesBubbleImageFactory", referenced from:
  objc-class-ref in ChatView.o
  "_OBJC_CLASS_$_JSQMessagesTimestampFormatter", referenced from:
  objc-class-ref in ChatView.o
  "_OBJC_CLASS_$_JSQMessagesViewController", referenced from:
  _OBJC_CLASS_$_ChatView in ChatView.o
  "_OBJC_CLASS_$_JSQPhotoMediaItem", referenced from:
  objc-class-ref in ChatView.o
  "_OBJC_CLASS_$_JSQSystemSoundPlayer", referenced from:
  objc-class-ref in ChatView.o
  "_OBJC_METACLASS_$_JSQMessagesViewController", referenced from:
  _OBJC_METACLASS_$_ChatView in ChatView.o
  "_kJSQMessagesCollectionViewCellLabelHeightDefault", referenced from:
  -[ChatView collectionView:layout:heightForCellTopLabelAtIndexPath:] in ChatView.o
  -[ChatView collectionView:layout:heightForMessageBubbleTopLabelAtIndexPath:] in ChatView.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)