Couldn't link opencv with qt creator , this error happens

[Being friendzoned sucks]

Hello,

I've been trying to solve this since yesterday with no luck,

first I downloaded the latest version of opencv , it came with it two folders , one is source and one is build I assumed build folder is the precompiled folder which is what I want, anyways I did this in the pro file:

INCLUDEPATH += C:/opencv/build/include
LIBS +=-LC:/opencv/build/x86/vc11/staticlib
CONFIG(debug, debug|release){
LIBS +=-lopencv_core249\
LIBS +=-lopencv_core249d\
LIBS +=-lopencv_highgui249\
LIBS +=-lopencv_highgui249d\
}

INCLUDEPATH += C:/opencv/build/include
LIBS +=-LC:/opencv/build/x86/vc11/staticlib
CONFIG(debug, debug|release){
LIBS +=-lopencv_core249\
LIBS +=-lopencv_core249d\
LIBS +=-lopencv_highgui249\
LIBS +=-lopencv_highgui249d\
}

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and it gives me this error:

:-1: error: LNK1104: cannot open file '+=-lopencv_core249d.obj'

:-1: error: LNK1104: cannot open file '+=-lopencv_core249d.obj'

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when I delete
LIBS +=-lopencv_core249d\

it gives me the same error except it's for the highgui249d file.