>From cc275331b4943e03d0c1c0e5264ab09974df7308 Mon Sep 17 00:00:00 2001
From: Arash Esbati <address@hidden>
Date: Tue, 25 Jun 2019 23:05:17 +0200
Subject: [PATCH] Suppress warning about unix-sync in nnmaildir.el

* nnmaildir.el (nnmaildir-request-replace-article): Check if the
function `unix-sync' is bound before running it.
---
 lisp/gnus/nnmaildir.el | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lisp/gnus/nnmaildir.el b/lisp/gnus/nnmaildir.el
index ac125c905a..3becee3511 100644
--- a/lisp/gnus/nnmaildir.el
+++ b/lisp/gnus/nnmaildir.el
@@ -1396,7 +1396,8 @@ nnmaildir-request-replace-article
       (with-current-buffer buffer
 	(write-region (point-min) (point-max) tmpfile nil 'no-message nil
 		      'excl))
-      (unix-sync) ;; no fsync :(
+      (when (fboundp 'unix-sync)
+	(unix-sync)) ;; no fsync :(
       (rename-file tmpfile (concat (nnmaildir--cur dir) file suffix) 'replace)
       t)))
 
-- 
2.22.0