Created attachment 225791 [details]
Patch for databases/postgis24/Makefile changing PostgreSQL 9.5 to 9.6
Without this patch make index complains about missing dependencies.
I just managed to make an index. Can you try again and point out the error?
(In reply to Loïc Bartoletti from comment #1)
It has vanished on my end too. Maybe a commit to Mk/* solved the issue earlier this week. I think it's safe to mark this PR as closed.