In addition to the missing UI, OpenMW RAM usage is very high if -DCMAKE_BUILD_TYPE=RelWithDebInfo is not set when building mygui.
I see a fix for this is already included in the Salsa repository for mygui. Please consider uploading a new release based on the current state of the git repository, as it would make OpenMW usable again without the need to locally build updated packages.
pgp0GRibRNn4c.pgp
Description: Signature digitale OpenPGP