-advent-$(VERS).tar.gz: $(SOURCES) $(DOCS)
- tar --transform='s:^:advent-$(VERS)/:' --show-transformed-names -cvzf advent-$(VERS).tar.gz $(SOURCES) $(DOCS)
+# Can't use GNU tar's --transform, needs to build under Alpine Linux
+advent-$(VERS).tar.gz: $(SOURCES) $(DOCS) advent.6
+ @ls $(SOURCES) $(DOCS) advent.1 | sed s:^:advent-$(VERS)/: >MANIFEST
+ @(cd ..; ln -s advent advent-$(VERS))
+ (cd ..; tar -czvf advent/advent-$(VERS).tar.gz `cat advent/MANIFEST`)
+ @(cd ..; rm advent-$(VERS))