Do you know why this happens: seminar.tpm mentions
texmf-dist/doc/latex/seminar/sem-user.ind
I've been doing the builds out of my copy of the repository for
convenience, and that file crept in during some update or another, and I
had failed to remove it.
I'll check for other instances, and do the next build out of a "clean"
checkout anyway.
Thanks,
Karl