Unresolved external symbol with openCV

问题

I'm trying to initialize OpenNI sensors using OpenCV in order to get depth map from depth sensor of my kinect.

The code I used to get one depth image:

and The output I get:

LNK2019: unresolved external symbol "int __cdelc cv::waitKey(int)" (?waitKey@cv@@YAHH@Z) reference in function _main

In the .pro file I have:

QT += widgets
WITH_OPENNI = ON

来源：https://stackoverflow.com/questions/16038602/unresolved-external-symbol-with-opencv