To build Qt (themself) with widgets for Ubuntu 24 (X11 windowing system). See also Building Qt 6.6 for Raspberry Pi on Raspberry Pi OS Tested with 22.04.3 LTS

Ubuntu with X11

Please switch to Xorg istead of Wayland.

How switch to X11 in Ubuntu

Test

echo $XDG_SESSION_TYPE

Should be x11

dev pack

modern Ubuntu

Then make available all dev pack. For Ubuntu 24 and more new

sudo sed -i 's/^Types: deb$/Types: deb deb-src/' /etc/apt/sources.list.d/ubuntu.sources

old Ubuntu

sudo nano /etc/apt/sources.list

and uncomment all strings with "deb-src"

Prepare

git clone https://github.com/AndreiCherniaev/Ubuntu_X11_Build_Qt_widgets.git
export MyBaseDir="$PWD/Ubuntu_X11_Build_Qt_widgets"

Build Qt themself

Install dependency

. "$MyBaseDir/Qt_themself/Ubuntu_dependency.sh"

Build Qt themself

"$MyBaseDir/Qt_themself/readme.sh"

Build example

export QT_DEBUG_PLUGINS=1 #usually no need, use in case of error
"$MyBaseDir/example/readme.sh"

example application

linuxFB

This step is optional. If you want try to run your app with linuxfb then use

# sudo adduser $USER video
export QT_DEBUG_PLUGINS=1
# export QT_QPA_PLATFORM=linuxfb
# export QT_QPA_EGLFS_FB=/dev/fb0
"$MyBaseDir/example/readme.sh"