X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/f9ba5e2255cf18092750fffacb6a9603571a2be5..6397b292615a5ffb9fdb5bd305736e2ef5f00e0d:/src/OS/os.h-Linux?ds=sidebyside

diff --git a/src/OS/os.h-Linux b/src/OS/os.h-Linux
index 539eeea33..63cf9babd 100644
--- a/src/OS/os.h-Linux
+++ b/src/OS/os.h-Linux
@@ -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 */