Oh, the workaround is so easy:
- open /usr/share/cnchi/data/packages.xml with your favourite editor
- delete the line that contains “xorg-mkfontdir”
- cnchi -p /usr/share/cnchi/data/packages.xml
I did not somehow try to manipulate the image unpacking/unsquashing it and resquashed/repacked it, to find out that the packages.xml is loaded from the internet and still failed. No that wasn’t me … doh!