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Try the next variant:

LIBS += -LC:\Work\Libs\output\openCV\release\x86\mingw\lib \
-lopencv_imgcodecs310 \
-lopencv_core310 \
-lopencv_highgui310 \
-lopencv_imgproc310 \
-lopencv_features2d310 \
-lopencv_calib3d310 \

-l prefix takes away the need to write lib* prefix and *.dll.a suffix