Trouble with #include in Windows

[mdresser]

I am trying to get started with Qt on Windows 10 using Qt Creator 4.8.1 with MSVC2017

I've gotten to the point of trying to compile/run the code and am getting an error C1083 as shown below:

I've verified that opencv.hpp does exist at the location indicated when I hover the cursor over #include but somehow the compiler isn't finding it?

The .pro file includes this:

win32: {
    include("D:\newopencv\build\opencv.pri")
}

The opencv.pri file looks like this:

INCLUDEPATH += D:/newopencv/build/install/include
Debug: {
LIBS += -lD:/newopencv/build/install/x64/vc15/lib/opencv_world342d
}
Release: {
LIBS += -lD:/newopencv/build/install/x64/vc15/lib/opencv_world342
}

opencv.hpp is essentially a long list of #includes and I wonder if one or more of them is missing but I don't see an obvious way to figure out which one short of parsing the file and comparing it to the include directory.

Thanks in advance for any suggestions!

[mdresser]

Problem Solved:
'/' not '\' in .pro file AND run qmake after change.

I tried changing '\' to '/' but didn't run qmake.