"No QML utility installed" not letting me use Qt6

[MH24]

Hi,

Wanted to use QPromise on my Qt Project. It needs Qt6 while I have Qt 5.15.3 on my QtCreator 6.02, with qmake 3.1. I am on a Ubuntu 22.04.

So I went to Tools->Options->Kits->Qt Versions and tried to add qmake executable but it says No QML Utility Installed. Have a look:

find /usr -iname qt6 gives me:

/usr/include/x86_64-linux-gnu/qt6
/usr/lib/x86_64-linux-gnu/qt6
/usr/lib/x86_64-linux-gnu/cmake/Qt6
/usr/lib/qt6
/usr/share/qt6
/usr/share/qtcreator/qml/qmlpuppet/mockfiles/qt6

find /usr -iname qmake6 gives me:

/usr/bin/qmake6
/usr/lib/qt6/bin/qmake6
/usr/share/lintian/overrides/qmake6
/usr/share/doc/qmake6

In the directory /usr/lib/x86_64-linux-gnu/qt6 I dont have a qmake executable. I have directories mkspecs and plugins and a qt6.conf.
The file qt6.conf has contents:

[Paths]
Prefix=/usr
ArchData=lib/x86_64-linux-gnu/qt6
Binaries=lib/qt6/bin
Data=share/qt6
Documentation=share/qt6/doc
Headers=include/x86_64-linux-gnu/qt6
HostBinaries=lib/qt6/bin
HostData=lib/x86_64-linux-gnu/qt6
HostLibraries=lib/x86_64-linux-gnu
Libraries=lib/x86_64-linux-gnu
LibraryExecutables=lib/x86_64-linux-gnu/qt6/mkspecs
Plugins=lib/x86_64-linux-gnu/qt6/plugins
Qml2Imports=lib/x86_64-linux-gnu/qt6/qml
Settings=/etc/xdg
Translations=share/qt6/translations

qtdiag gives me:

Qt 5.15.3 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 11.3.0) on "xcb" 
OS: Ubuntu 22.04.2 LTS [linux version 5.19.0-35-generic]

Architecture: x86_64; features: SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 AVX AVX2

Environment:

Features: QT_NO_EXCEPTIONS

Library info:
  PrefixPath: /usr
  DocumentationPath: /usr/share/qt5/doc
  HeadersPath: /usr/include/x86_64-linux-gnu/qt5
  LibrariesPath: /usr/lib/x86_64-linux-gnu
  LibraryExecutablesPath: /usr/lib/x86_64-linux-gnu/qt5/libexec
  BinariesPath: /usr/lib/qt5/bin
  PluginsPath: /usr/lib/x86_64-linux-gnu/qt5/plugins
  ImportsPath: /usr/lib/x86_64-linux-gnu/qt5/imports
  Qml2ImportsPath: /usr/lib/x86_64-linux-gnu/qt5/qml
  ArchDataPath: /usr/lib/x86_64-linux-gnu/qt5
  DataPath: /usr/share/qt5
  TranslationsPath: /usr/share/qt5/translations
  ExamplesPath: /usr/lib/x86_64-linux-gnu/qt5/examples
  TestsPath: /usr/tests
  SettingsPath: /etc/xdg

Standard paths [*...* denote writable entry]:
  DesktopLocation: "Desktop" */root/Desktop*
  DocumentsLocation: "Documents" */root/Documents*
  FontsLocation: "Fonts" */root/.local/share/fonts* /root/.fonts /usr/local/share/fonts /usr/share/fonts
  ApplicationsLocation: "Applications" */root/.local/share/applications* /usr/local/share/applications /usr/share/applications
  MusicLocation: "Music" */root/Music*
  MoviesLocation: "Movies" */root/Videos*
  PicturesLocation: "Pictures" */root/Pictures*
  TempLocation: "Temporary Directory" */tmp*
  HomeLocation: "Home" */root*
  AppLocalDataLocation: "Application Data" */root/.local/share/QtProject/qtdiag* /usr/local/share/QtProject/qtdiag /usr/share/QtProject/qtdiag
  CacheLocation: "Cache" */root/.cache/QtProject/qtdiag*
  GenericDataLocation: "Shared Data" */root/.local/share* /usr/local/share /usr/share
  RuntimeLocation: "Runtime" */tmp/runtime-root*
  ConfigLocation: "Configuration" */root/.config* /etc/xdg
  DownloadLocation: "Download" */root/Downloads*
  GenericCacheLocation: "Shared Cache" */root/.cache*
  GenericConfigLocation: "Shared Configuration" */root/.config* /etc/xdg
  AppDataLocation: "Application Data" */root/.local/share/QtProject/qtdiag* /usr/local/share/QtProject/qtdiag /usr/share/QtProject/qtdiag
  AppConfigLocation: "Application Configuration" */root/.config/QtProject/qtdiag* /etc/xdg/QtProject/qtdiag

I cannot Link with Qt.. either. When I press that button and take it to Qt executable, the buttons remain disabled.
See:

Qt 5.15.3 works just fine but I need a kit with a working Qt 6 to be able to use QPromise

[sierdzio]

These are very unusual paths for a Qt installation. Best use the Qt online installer, it works with multiple versions of Qt and is well tested.

If you want to use QtPromise with Qt 5, take a look at: https://github.com/simonbrunel/qtpromise

[MH24]

@sierdzio I did use Qt Installer with Qt 6 but I had issues getting qmake to run so I shifted to cmake and Qt5. Thank you for the link to QPromise. I will try this and the standard's original std::promise and future too.

[sierdzio]

@MH24 said in "No QML utility installed" not letting me use Qt6:

I did use Qt Installer with Qt 6 but I had issues getting qmake to run so I shifted to cmake and Qt5

You can install both Qt 5 and 6 using the installer.

[JoeCFD]

@MH24 I guess you are using the Qt versions(Qt5.15.3 and Qt6.2.4) from Linux distributions. If you installed Qt from installer, default qt locations are normally under /opt/. Better to install Qt6.5 or above because Qt 6.2.4 is kind of old in Qt6.

type command:
which qml
to check if qml module is installed. If not, install qml module.

If you install Qt from installer, qml module is available. Check the dir /opt/ and set qmake path properly on Kits->Qt Versions with qt path under /opt/Qt...

[sierdzio]

@JoeCFD said in "No QML utility installed" not letting me use Qt6:

If you installed Qt from installer, default qt locations are normally under /opt/

No need to install as root user. A normal installation is enough and then the default path is /home/<username>/Qt.

[JoeCFD]

@sierdzio this place is not a good place because it is user name dependent. For deployment and team work, /opt is the traditional location for third party installation on Unix/Linux

[sierdzio]

@JoeCFD said in "No QML utility installed" not letting me use Qt6:

@sierdzio this place is not a good place because it is user name dependent. For deployment and team work, /opt is the traditional location for third party installation on Unix/Linux

Do you have multiple users on your system? I doubt that. Installing for current user is simpler.

For deployment people would typically use some CI/CD solution, where Qt is delivered in a different form anyway.

But of course, it's up to everybody to decide for themselves.

[Xmojtabw]

I have exactly the same problem
sudo apt install qml-qt6
solved the problem for me