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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
/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
解决办法：LIBS += -L/usr/local/lib -lopencv_core -lopencv_imgcodecs -lopencv_highgui