>From d77a2e45004f5d6d8496e5fed260774205efe42a Mon Sep 17 00:00:00 2001
From: Alan Third <alan@idiocy.org>
Date: Sun, 24 Sep 2017 12:01:03 +0100
Subject: [PATCH] Fix build on macOS (bug#28571)

* src/conf_post.h (HAVE_FUTIMENS, HAVE_FUTIMESAT) [DARWIN_OS]:
Undefine.
---
 src/conf_post.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/conf_post.h b/src/conf_post.h
index febdb8b8bf..dfdb0aa3eb 100644
--- a/src/conf_post.h
+++ b/src/conf_post.h
@@ -397,3 +397,11 @@ extern int emacs_setenv_TZ (char const *);
 #else
 # define UNINIT /* empty */
 #endif
+
+/* macOS 10.13 supports futimens and futimesat, older versions don't
+   but can appear as though they do.  Disable them entirely to avoid
+   breaking cross-version builds on macOS.  */
+#ifdef DARWIN_OS
+# undef HAVE_FUTIMENS
+# undef HAVE_FUTIMESAT
+#endif
-- 
2.14.1