Issues with the qt6 version in Ubuntu.

JESS0440

the system does not recognize the qmake command, even though it is installed correctly

Paul Colby

system does not recognize the qmake command

Modern Ubuntu's use a qtchooser package which sits in between things like the qmake command, and the real qmake. Consider, for example:

$ which qmake
/usr/bin/qmake
$ ls -l /usr/bin/qmake 
lrwxrwxrwx 1 root root 9 Mar 23  2020 /usr/bin/qmake -> qtchooser

Here you can see that the qmake entry is actually a symbolic link to qtchooser. Try, for example:

qtchooser -print-env # See the current enabled version.
qtchooser -list-versions # See which Qt versions are installed.
export QT_SELECT=6
qtchooser -print-env # See the current enabled version.
qmake -v

Read the qtchooser man page for more info.

Cheers.

jsulm

@JESS0440 said in Issues with the qt6 version in Ubuntu.:

even though it is installed correctly

Where? And how was it installed? If you installed Qt using online installer, then you will need to provide absolute path to qmake or set PATH.

JoeCFD

@Paul-Colby qtchooser seems to be a deprecated tool.
@JESS0440 If you installed Qt with Qt Installer, it was installed by default under /opt/Qt and you need to set the path for the installed Qt.

Paul Colby

@JoeCFD said in Issues with the qt6 version in Ubuntu.:

@Paul-Colby qtchooser seems to be a deprecated tool.

Nah, it's definitely not deprecated (as far as I can tell), and will be in the next release of Ubuntu too: https://packages.ubuntu.com/search?keywords=qtchooser&searchon=names&suite=all&section=all

qtchooser is Ubuntu's solution for installing multiple Qt versions from the official Ubuntu servers, but does not apply to any versions installed via the Qt Online Installer. So , as you suggested, if @JESS0440 installed via the Qt Online Installer, thenqtchooser is not relevant.

As @jsulm asked, we need to know:

Where? And how was it installed?

:)

JoeCFD

@Paul-Colby I am not sure it is usable even when it is built. For example, Qt Gstreamer is built, but not usable anymore since its development is stopped. I do not use qt chooser.