long-standing set-up errors on upgrade (elimination of x cut buffers)

[Joe Brenner <doom@kzsu.stanford.edu>]

I see in NEWS

  "*** Support for X cut buffers has been removed."

For some time, I've had this in my emacs init files:

  (setq x-select-enable-clipboard t)
  (setq interprogram-paste-function 'x-cut-buffer-or-selection-value)

Now, with a recent build of bzr emacs, I see that leading to this error
message:

  current-kill:
    Symbol's function definition is void: x-cut-buffer-or-selection-value

I personally am not actually fussy about the details of how X the
clipboard talks to the kill-ring and vice versa.  I need there to be a
way to do it, but it almost doesn't matter which way it is (e.g. I prefer
a yank to snag the current X selection, but if I need to do a Control C
first before that will work, I can live with that).

But what I do find really disturbing is when stuff I've had in my set-up
for years suddenly causes problems because I did an upgrade.

(Of late, the gnus emacs team seems to be having trouble with the idea
of stable interfaces.)