qt5-default - 5.11.3+dfsg1-1+deb10u3 main

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 sets Qt 5 to be the default Qt version to be used when
using development binaries like qmake. It provides a default
configuration for qtchooser, but does not prevent alternative Qt
installations from being used.
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This package should not be used for building Debian packages. Take a
look at https://qt-kde-team.pages.debian.net/packagingqtbasedstuff.html for
more information.