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

here's one of my pro files:

    # Blah Application

TEMPLATE  = app
CONFIG   += qt console staticlib debug_and_release
QT       -= gui
QT       += network sql xml
TARGET    = blah

CONFIG(debug, debug|release){
    DESTDIR = debug
    LIBS += -L../../../lib/core/debug -lcore
} else {
    DESTDIR = release
    LIBS += -L../../../lib/core/release -lcore
}
DEPENDPATH  += . ../../lib ../../../lib/core
INCLUDEPATH += . ../../lib ../../../lib/core

# Library files
HEADERS += mtBlahRTP.h
SOURCES += mtBlahRTP.cpp

# Input
HEADERS +=
SOURCES += main.cpp

The include path points to the RELATIVE directory of my lib files. mtBlahRTP.h and mtBlahRTP.cpp are in ../../lib

Answer 2

I had to do two steps: (re-)run qmake and rebuild the whole project - only then the INCLUDEPATH setting was considered correctly. (With QtCreator 3.5 and 3.6 (Qt 5.5 and Qt 5.6) on Windows.)

Answer 3

I ran into a similar issue and what I found is that the QtCreator IDE is not re-reading the results of qmake and updating the "Cannot open" message. You need to close the offending file and re-open it - then you'll see that it no longer displays the error.

Answer 4

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.

Answer 5

You have to run qmake(build->run qmake) to validate changes in the pro file. Qt creator Adding external library (still: Cannot open include file: 'GL/glew.h')

Answer 6

I have the same question, before building or running, you should qmake(Build=>qmake) it.

My configurations for INCLUDEPATH:

INCLUDEPATH+=D:\opencv\opencv\build\include
INCLUDEPATH+=D:\opencv\opencv\build\include\opencv
INCLUDEPATH+=D:\opencv\opencv\build\include\opencv2