Hello
I've got error in cmake:

Qt Code: 
  1. Error: Undefined interface in line: Q_INTERFACES(QTextObjectInterface)
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Qt Code: 
  1. #include <QObject>
  2. #include <QTextObjectInterface>
  3.  
  4. class ImageHandler : public QObject, public QTextObjectInterface
  5. {
  6.     Q_OBJECT
  7.     Q_INTERFACES(QTextObjectInterface)
  8.     public:
  9.         ImageHandler(TextDocument *doc);
  10.         QSizeF intrinsicSize(QTextDocument *doc, int posInDoc, const QTextFormat &format);
  11.         void drawObject(QPainter *painter, const QRectF &rect, QTextDocument *doc, int posInDoc, const QTextFormat &format);
  12.  
  13.     private:
  14.         QTextObjectInterface *m_defaultImageHandler;
  15.  
  16. };
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what I must add to cmake ? or into code ?