breakage in "make index"

[Robert Huff]

	[I'm posting this here because "ports@" is the listed
maintainer.]

	On a system running:

FreeBSD 13.0-CURRENT #0 r354131: Mon Oct 28 17:27:33 EDT 2019  amd64

	with the ports tree updated every night, for about the last week
"make index" has failed because:

--- describe.x11-wm ---
make_index: /usr/ports/astro/google-earth: no entry for /usr/ports/graphics/linux-c6-dri
 Done.

	and therefore "pkg version" also fails.
	This is beyond my skill set; would someone who knows how please
make the appropriate adjustment?


			Respectfully,


				Robert Huff