Qt does not find some header files (Debian)

[need4openid]

I just installed Qt on Debian Stretch from DVD (offline install).
I can compile and run a simple, just a mainwindow project. But when it comes to include QJsonObject, it just cannot detect this file, but it does exist under my /usr/include directory.

[SGaist]

Hi,

Maybe a silly question but are you sure you are using Qt 5 and not Qt 4 ?

[jsulm]

@need4openid Do you have

QT += core

in you pro file?

[mrjj]

Hi
Just as a note.
All classes list their key/module to add to .pro file

[need4openid]

By default I have

QT += core gui

in my .pro file when I create a new desktop application project. So it is not because that.

[SGaist]

Hi,

Maybe a silly question but are you sure you are using Qt 5 and not Qt 4 ?

[jsulm]

@need4openid Can you show how you include this header file?

[need4openid]

@SGaist said in Qt does not find some header files (Debian):

Hi,

Maybe a silly question but are you sure you are using Qt 5 and not Qt 4 ?

No such question as silly question. That was it, I had both installed.
Thanks guys