Hi gibor,
thank you again for the hint.
As it turns out, I was mistaken by the wok's report, which stated that systemd could not be found and ended with an error. This, as I found out now, was just a report from the configuration part, that searched for available assests and just told me that systemd was not installed.
By that I focused on systemd and overlooked the actual error that in fact hid behind:
GEN org.freedesktop.UDisks2.policy
/usr/bin/msgfmt: cannot locate ITS rules for org.freedesktop.UDisks2.policy.in
msgfmt, being part of gettext-tools, seems to be working ok.
Based on my first search result, we have an issue with either intltool (which is the latest version 0.51.0) or rather with polkit (installed version is 0.119).
For polkit, there is a version 0.200 on gitlab, but this release depends on libmozjs, which I provided already, but which adds about 7M of package size...
So I understand that this is an issue about converting the file org.freedesktop.UDisks2.policy.in located in the sources/data directory into org.freedesktop.UDisks2.policy, a file that is needed in order to trigger polkit.
But how can I solve it? Any ideas or even better, deeper insights?