qtbase5-private-gles-dev - 5.15.2+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.
.
This package contains the private header development files for building some
Qt 5 applications like Qt Creator QML Designer plugin.
.
Normally you should use qtbase5-dev or qtbase5-private-dev package. Use this
one only if your software supports only OpenGL ES or if you want to make use
of some OpenGL ES specific API. Use at your own risk.