Opencv安装编译时，未启用QT的问题

ubuntu下，c++ 开发opencv，编译时没有报错， 运行时，发现报如下错 The library is compiled without QT support in function

原因是，安装编译时，未启用QT，报错如下

terminate called after throwing an instance of 'cv::Exception'
  what():  OpenCV(4.2.0) ~/opencv-4.2.0/opencv/modules/highgui/src/window.cpp:597: error: (-213:The function/feature is not implemented) The library is compiled without QT support in function 'createButton'

解决办法，重新安装编译opencv

sudo cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=/usr/local \
-D WITH_TBB=ON \
-D WITH_V4L=ON \
-D WITH_QT=ON \
-D WITH_GTK=ON \
-D WITH_OPENGL=ON \
-D WITH_VTK=ON \
-D OPENCV_GENERATE_PKGCONFIG=YES