异常：

/usr/bin/ld: ./src/flann.o: undefined reference to symbol '_ZN2cv5flann12SearchParamsC1Eifb'

解决：

-lopencv_flann to your linker options.

异常：

Qt Error : main.o: undefined reference to symbol '_ZN2cv6String10deallocateEv'

解决

LIBS += -L/usr/local/lib -lopencv_core -lopencv_imgcodecs -lopencv_highgui

error: main.o: undefined reference to symbol ‘_ZN2cv6imreadERKNS_6StringEi’
/usr/local/OpenCV/Release/lib/libopencv_imgcodecs.so.3.0: error: error adding symbols: DSO missing from command line
error: collect2: error: ld returned 1 exit status

解决方案

问题描述里已经表述得很清楚了，需要链接libopencv_imgcodecs.so，这可能是和2.x版本的一处不同。

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opencv undefined reference to symbol '_ZN2c...异常

Qt Error : main.o: undefined reference to symbol '_ZN2cv6String10deallocateEv'

解决方案

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