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-rw-r--r--lisp/vc-arch.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/vc-arch.el b/lisp/vc-arch.el
index 40ec2fb3884..b821928c539 100644
--- a/lisp/vc-arch.el
+++ b/lisp/vc-arch.el
@@ -377,7 +377,7 @@ Return non-nil if FILE is unchanged."
(setq newvers nil))
(if newvers
(error "Diffing specific revisions not implemented.")
- (let* ((async (fboundp 'start-process))
+ (let* ((async (and (not vc-disable-async-diff) (fboundp 'start-process)))
;; Run the command from the root dir.
(default-directory (vc-arch-root file))
(status