qt6-base-dev binary package in Ubuntu Oracular i386

 Qt is a cross-platform C++ application framework. Qt's primary feature
 is its rich set of widgets that provide standard GUI functionality.
 .
 This package contains the header development files used for building
 Qt 6 applications.
 .
 If you are interested in packaging Qt 6 stuff please take a look at
 https://qt-kde-team.pages.debian.net/packagingqtbasedstuff.html