From 69ff535b548e0c78be945774088416db3d7ab45d Mon Sep 17 00:00:00 2001
From: Andrey Filipenkov <decapitator@ukr.net>
Date: Sat, 25 Apr 2026 07:53:42 -0400
Subject: [PATCH] Help: Document CPACK_COMMAND_SYNC variable

It was added by commit ef739edd20 (CPack/DragNDrop: Prevent hdiutil
"resource is busy" failures, 2025-08-15, v4.2.0-rc1~315^2).
---
 Help/cpack_gen/dmg.rst | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Help/cpack_gen/dmg.rst b/Help/cpack_gen/dmg.rst
index 0bd52ec569..1307047c87 100644
--- a/Help/cpack_gen/dmg.rst
+++ b/Help/cpack_gen/dmg.rst
@@ -160,3 +160,11 @@ on macOS:
  Path to the ``Rez(1)`` command used to compile resources on macOS. This
  variable can be used to override the automatically detected command (or
  specify its location if the auto-detection fails to find it).
+
+.. variable:: CPACK_COMMAND_SYNC
+
+ .. versionadded:: 4.2
+
+ Path to the ``sync(8)`` command used to force completion of pending disk writes
+ on macOS. This variable can be used to override the automatically detected
+ command (or specify its location if the auto-detection fails to find it).