Dave,
Vlad Seryakov was the last one working on ns_cache https://openacs.org/forums/message-view?message_id=51200 and made it available from the following site ftp://ftp.crystalballinc.com/pub/vlad/nscache.tar.gz
We can't be distributing OpenACS requiring folks to get the
basic prerequisites from CVS.
As Stan points out, we do this already. Our official installation notes say "get ns_cache from cvs". The automated installation script from Malte gets if from cvs as well.
So, if only debian is using the old version, would it not be best to point the debian maintainer to the oacs-installation guide and ask him/her to upgrade the debian package accordingly?
-gustaf
PS: there is active work improving ns_cache in the naviserver project.