INCLUDEPATH in qmake project file doesn't work

Question

I\'ve got a problem with include in a qmake project. In my .pro file I\'ve got:

INCLUDEPATH += \"C:\\OpenCV\\build\\include\"

and in my cpp

Answer 1

You need to do several things. Fist, in the .pro file, you need quotation marks two backslashes at a time, like this:

INCLUDEPATH += "C:\\OpenCV\\build\\include\\opencv\\cv.h"

You alse need a frontslash in the #include in your .cpp file like this:

#include 

When you've done this, delete the build folder. This is the folder with a very complicated name of the type build-untitled-Desktop_Qt_5_7_0_MSVC2015_32bit-Release. Then, in the Build menu, press "Run qmake". When you've done all this, it should compile fine.