Qt6 Interface
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This article applies to Qt6 widgetset only.
See also: Multiplatform Programming Guide
Introduction
This interface is based on Qt 6 (Qt 6.2.3 LTS). For documentation, fixes and download, go to Qt Project (Installers at download 6.2.3). Lazarus with Qt6 interface (qt6-lcl) can be used on Windows 32/64, Linux x32/x64/arm, macOS x64 (Cocoa). Qt6 widgetsets will be available in Lazarus from 2.4 stable release. Currently you can use it from trunk.
Most current Linux distros have a suitable Qt6 in their standard repositories, but till lazarus 2.4 release you must build libQt6Pas on your own.