Ubuntu qt 使用opencv库出现undefined reference问题解决

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解决方法:
(1)每次在.pro文件中加入:
INCLUDEPATH +=/usr/local/include/opencv
LIBS += /usr/local/lib/libopencv_core.so\
/usr/local/lib/libopencv_imgproc.so \
/usr/local/lib/libopencv_video.so \

/usr/local/lib/libopencv_highgui.so  \

/usr/local/lib/libopencv_ml.so


(2)一劳永逸的方法

添加QT的环境配置 (参考:http://www.linuxidc.com/Linux/2010-10/29336.htm)
1 sudo gedit/usr/share/qt4/mkspecs/default/qmake.conf
2在文件末尾添加:
INCLUDEPATH +=/usr/local/include/opencv
LIBS += /usr/local/lib/libopencv_core.so\
/usr/local/lib/libopencv_imgproc.so \
/usr/local/lib/libopencv_video.so \
/usr/local/lib/libopencv_highgui.so




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