X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/1e1ddfac79fbcd052f199500a6493c7f79cb8462..f8219eb4170545e1f1375973348ff7975e559a7a:/src/OS/os.h-GNU

diff --git a/src/OS/os.h-GNU b/src/OS/os.h-GNU
index 59130ef10..4fe55fa5e 100644
--- a/src/OS/os.h-GNU
+++ b/src/OS/os.h-GNU
@@ -1,5 +1,8 @@
 /* Exim: OS-specific C header file for GNU/Hurd */
-/* Copyright (c) The Exim Maintainers 2020 */
+/* Copyright (c) The Exim Maintainers 2020 - 2021 */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <features.h>
 
 #define CRYPT_H
 #define GLIBC_IP_OPTIONS
@@ -25,4 +28,8 @@ typedef struct flock flock_t;
 as well as any supplementary groups*/
 #define OS_SETGROUPS_ZERO_DROPS_ALL
 
+#if _POSIX_C_SOURCE >= 200809L || _ATFILE_SOURCE
+# define EXIM_HAVE_OPENAT
+#endif
+
 /* End */