X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/10c50704c1efb095f3b35de3a535f4ea311cb3e5..902fbd6974bac4abf70a4c567534669a86ff763e:/src/OS/os.h-Linux

diff --git a/src/OS/os.h-Linux b/src/OS/os.h-Linux
index 6400e798e..510865c66 100644
--- a/src/OS/os.h-Linux
+++ b/src/OS/os.h-Linux
@@ -69,5 +69,9 @@ then change the 0 to 1 in the next block. */
 # define EXIM_HAVE_OPENAT
 #endif
 
+#if defined(TCP_FASTOPEN) && !defined(MSG_FASTOPEN)
+# define MSG_FASTOPEN 0x20000000
+#endif
+
 
 /* End */