Subject: bug#66211: 30.0.50; C-x v v in vc-diff does not work with lesser versionf of patch

From: "Alfred M. Szmidt" <[email-masked]>
Date: Tue, 26 Sep 2023 11:08:06 -0400

diff --git a/lisp/vc/vc.el b/lisp/vc/vc.el
   index 2f4b028bb4a..356da5ddfac 100644
   --- a/lisp/vc/vc.el
   +++ b/lisp/vc/vc.el
   @@ -1724,7 +1724,8 @@ vc-default-checkin-patch
						  nil
						  "-p1"
						  "-r" null-device
   -                                             "--no-backup-if-mismatch"
   +                                             "--posix"
   +                                             "--remove-empty-files"

Patch on BSD doe not have --remote-empty-files.