Ok, I step further - thanks to pawel-soja!

But, still not there:

fatal: unable to connect to anongit.freedesktop.org:
anongit.freedesktop.org[0: 131.252.210.161]: errno=Connection refused

Action: fetch for libs/dbus-kstars:master FAILED
*** Craft all failed: libs/dbus-kstars after 0 seconds ***
fatal error: package libs/dbus-kstars all failed
Craft stopped with out completing

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~ Something failed
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

And a sidenote (because the build environment is not fully generated):

QtCreator is not able to configure the project:

Could not find a package configuration file provided by "Qt5Qml" with any
of the following names:

Qt5QmlConfig.cmake
qt5qml-config.cmake

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