Qt Creator LNK2019:Unresolved external symbol using OpenCV - c++

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.