Debian notes

README.md

@@ -1,17 +1,44 @@
 # Celestia
-Celestia is a "real-time space simulation that lets you experience our universe in three dimensions".
+Celestia is a "real-time space simulation that lets you experience
+our universe in three dimensions".
 
 # Upstream
-This repo is a lesser fork of the upstream project, which has been revived.
+This repo is a lesser fork of the upstream project,
+which has been revived.
 
 * https://celestia.space/
 
 * https://github.com/CelestiaProject/Celestia
 
-See also: `README-upstream`, README-upstream.md`.
+See also: `README-upstream`, `README-upstream.md`.
 
 ## License/Copyright
 GPLv2+
 
 Copyright © 2001-2021, Celestia Development Team
 
+# Debian
+Package was removed from Debian in the ancient days due to bitrot.
+The upstream code has a new team and active development, using
+recent libraries. The package can be built under Debian Ok, except
+for the `data/` files.
+
+Debian upstream bug:
+
+* https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=809916
+
+```
+Upstream has not produced any new releases in the last 4 years. In the
+mean time, the package is accumulating bugs due to bitrot. It already
+wasn't a trouble-free package, due to some quite important resources not
+being DFSG compliant.
+```
+
+I do see some of the resources now are CC-by-SA 4.0, a license which
+didn't exist when the Debian bug was created. So it may be that it
+can be built happily without DFSG issues using new data files.
+
+Debian tracker link:
+
+* https://tracker.debian.org/pkg/celestia
+