From bf27c418695214a77cc369b8069f8b9c27d0eb1f Mon Sep 17 00:00:00 2001
From: Dmitry Gutov <dgutov@yandex.ru>
Date: Tue, 18 Aug 2015 17:49:36 +0300
Subject: [PATCH] vc-disable-async-diff: Don't bind when it's undefined

Fixes #47
---
 diff-hl.el | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/diff-hl.el b/diff-hl.el
index 5b6510d55..8f2221a7c 100644
--- a/diff-hl.el
+++ b/diff-hl.el
@@ -213,7 +213,8 @@
          (vc-hg-diff-switches nil)
          (vc-svn-diff-switches nil)
          (vc-diff-switches '("-U0"))
-         (vc-disable-async-diff t))
+         ,@(when (boundp 'vc-disable-async-diff)
+             '((vc-disable-async-diff t))))
      ,body))
 
 (defun diff-hl-changes ()
-- 
2.39.2