'opencv2/opencv.hpp' file not found

[blackbox]

Dear all,
I want to use openCV with Qt but I get this error:

'opencv2/opencv.hpp' file not found
 'opencv2/highgui.hpp' file not found
 'opencv2/core.hpp' file not found

so Qt does not know where these files are located. I added them manually.

Finally my .pro file is:

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

SOURCES += \
    main.cpp \

HEADERS += \
    main.h

FORMS += \
    main.ui

LIBS += -L/usr/local/Cellar/opencv/4.4.0_2/lib \
     -lopencv_core \
     -lopencv_highgui

INCLUDEPATH += \
         /usr/local/include

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

I know this is one of the most encountered problem for users new to Qt. I searched well the problem but nothing solved it. I am sure the path of libraries is correct because I have already used openCV libs in Xcode.

openCV is the latest version: 4.4.0. Is the latest version not appropriate for Qt? What do you think? I reinstalled it but nothing changes. And it is not an easy task to remove openCV and degrade its version i think.

Any suggestion?

Thank you for your time and attention.

[SGaist]

Hi and welcome to devnet,

Where exactly are those file located on your machine ?

[blackbox]

They are located in:

/usr/local/Cellar/opencv/4.4.0_2/lib

as I write them in 'LIBS' in my .pro file.

[SGaist]

I meant the header files since those are the ones currently not found.

[SilentWolf]

Lack INCLUDEPATH such as:
INCLUDEPATH += /usr/local/include