qt6-base-dev - 6.7.2+dfsg-4 main

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