Thank you, Bruce. I appreciate your help, but I'm not sure it applies — please correct me if I'm mistaken. I'm running Alpine on bare metal, and the musl `luametatex` binary seems operable. The problem seems, as far as I can tell, that the installation failed to establish whatever settings provide defaults, which is why (for example) it has no format file by default. I could certainly be wrong, as this is very new to me.