Unsupported Qt version, 5.9+ is required

koahnig

So you have downloaded the online installer, which is good.

You need to check the different version and choose one which is suitable for you. There is a menu coming up giving you the choices for Qt libs to install. The current release is Qt 5.12.1. Best is to choose this for installation. Evenually you need to update also your compiler.

The settings in Qt creator are typically updated. Possibly you have to do a restart.

Note: Qt creator is only an IDE. This IDE is based on and uses Qt libs. However, for using Qt libs you need to install those separately.
In creator you can select different tool chains consiting of Qt libs and the associated compilers.

csg1

In the installer Select Components dialog, I chose: 5.11.3 (on Ubuntu) and it is being installed now. This should solve it. I somehow didn't see this pane in the first time I was installing it. The approximated installation size is 7.9 GB. Isn't this too large for an IDE?

SGaist

Hi,

That's not the size of Qt Creator. If you just ticked the checkbox, you have likely selected the installation for desktop and android and all the related components.

By the way, why not use the latest version available ?

csg1

Oh I see. That makes sense. Because 5.11.3 is what is being suggested by the project that I will be building.

SGaist

Qt is forward and backward compatible within a major version.

csg1

Unfortunately the problem still persists. The About Qt Creator displays the following:

Qt Creator 4.8.1
Based on Qt 5.12.0 (GCC 5.3.1 20160406 (Red Hat 5.3.1-6), 64 bit)
Built on Jan 16 2019 00:19:04
From revision e8df914ef2
Copyright 2008-2018 The Qt Company Ltd. All rights reserved.
The program is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

but the project still outputs the same error:

Project MESSAGE: Qt version 4.8.7
Project ERROR: Unsupported Qt version, 5.9+ is required

The code that generates this output is:

message(Qt version $$[QT_VERSION])

!equals(QT_MAJOR_VERSION, 5) | !greaterThan(QT_MINOR_VERSION, 8) {
    error("Unsupported Qt version, 5.9+ is required")
}

SGaist

Did you change the kit used to build your project ?

csg1

There is only one kit installed, I assume the first one is overwritten.

SGaist

Is it the 5.11.3 ?
Looks like you could be using your distribution provided Qt ?
One other thing you can do is:

Close Qt Creator
Nuke your .pro.user file so you will have to reconfigure when opening the project
Start Qt Creator
Open your project and use the 5.11.3 Kit

JKSH

@csg1 said in Unsupported Qt version, 5.9+ is required:

There is only one kit installed, I assume the first one is overwritten.

You did not uninstall Qt 4.8.7, so it still exists in your system. It is not overwritten.

Follow @SGaist's latest instructions to switch to Qt 5.11.3.