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

Under windows you have to eliminate the -I before each directory that is added into the INCLUDEPATH variable. For example: Under windows:

INCLUDEPATH += "C:\lib\boost_1_61_0" (back-slash)

Under linux & mac:

INCLUDEPATH += -I"$$(HOME)/lib/boost_1_61_0" (note the -I and forward-slash)

I'm not sure whether it depends on different qmake version or not. But after finishing qmake command, I check the Makefile and the double -I is the issue.