-advent-$(VERS).tar.gz: $(SOURCES) advent.6
- tar --transform='s:^:advent-$(VERS)/:' --show-transformed-names -cvzf advent-$(VERS).tar.gz $(SOURCES) advent.6
+# README.adoc exists because that filename is magic on GitLab.
+DOCS=COPYING NEWS README.adoc TODO \
+ advent.adoc history.adoc index.adoc hints.adoc advent.6