X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/c5db348c5e29e93e51389fa0079f829967c5da82..bcbca153505de435c881e71297fde83c3ac02cc1:/src/OS/os.h-Linux

diff --git a/src/OS/os.h-Linux b/src/OS/os.h-Linux
index 88c4d9117..63cf9babd 100644
--- a/src/OS/os.h-Linux
+++ b/src/OS/os.h-Linux
@@ -1,5 +1,5 @@
 /* Exim: OS-specific C header file for Linux */
-/* Copyright (c) University of Cambridge 2017 */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 
@@ -83,6 +83,9 @@ then change the 0 to 1 in the next block. */
 # define MSG_FASTOPEN 0x20000000
 #endif
 #define EXIM_HAVE_TCPI_UNACKED
+#ifndef TCPI_OPT_SYN_DATA
+# define TCPI_OPT_SYN_DATA 32
+#endif
 
 
 /* End */