"inflate: unknown compression method" after server upgrade to 1.11.16

[David Carson]

When I use a client which inserts the global '-l' option together with
my newly upgraded server, I get the expected "global `-l' option
ignored" warning.

However, if I also specify a compression level, I get the following:

  address@hidden tools] cvs -nq -z1 up
  cvs update: inflate: unknown compression method
  cvs [update aborted]: reading from server: Input/output error

Server:
cvs 1.11.16
RedHat 7.2

Client:
cvs 1.11.1p1
RedHat 7.2

Note that I have many clients deployed, so I'd like to understand the
problem (not just deploy newer clients).

Thanks,
David

Please respond to this newsgroup, not my e-mail address.