Qt Creator LNK2019:Unresolved external symbol using OpenCV

Question

I've been trying to compile a project for the past two days in Qt using OpenCV but can't figure out why it doesn't. My application has only main.cpp , widget.cpp and widget.h

here is my .pro file

  QT       += core gui opengl
  greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

  TARGET = FaceDetect
  TEMPLATE = app
  SOURCES += main.cpp\
             widget.cpp

  HEADERS  += widget.h

  FORMS    += widget.ui

  INCLUDEPATH += C:/opencv/build/include/
  LIBS += -LC:/opencv/build/x64/vc10/lib/
           -libopencv_core2410
           -libopencv_highgui2410
           -libopencv_imgproc2410
           -libopencv_features2d2410
            -libopencv_calib3d24610

and these are the errors I keep getting:

main.obj:-1: error: LNK2019: unresolved external symbol "public: void __thiscall cv::Mat::deallocate(void)" (?deallocate@Mat@cv@@QAEXXZ) referenced in function "public: void __thiscall cv::Mat::release(void)" (?release@Mat@cv@@QAEXXZ)    

moc_widget.obj:-1: error: LNK2001: unresolved external symbol "public: void __thiscall cv::Mat::deallocate(void)" (?deallocate@Mat@cv@@QAEXXZ)

moc_widget.obj:-1: error: LNK2001: unresolved external symbol "public: void __thiscall cv::Mat::deallocate(void)" (?deallocate@Mat@cv@@QAEXXZ)

Can anyone explain why and how I an get rid of these please?

Thanks!

Answer 1

Put a slash at the end of every file in LIBS and save it.

LIBS += -LC:/opencv/build/x64/vc10/lib/
       -libopencv_core2410 \
       -libopencv_highgui2410 \
       -libopencv_imgproc2410 \ 
       -libopencv_features2d2410 \ 
       -libopencv_calib3d24610

Now right click the project folder and click "Run qmake" and then 'build' it, this will 'make' the file and consider the changes made in .pro file.