X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/e924c08b7d031b712013a7a897e2d430b302fe6c..1ccd5f670a432f98e94b384dd169a1a760dced9a:/src/OS/os.h-Linux

diff --git a/src/OS/os.h-Linux b/src/OS/os.h-Linux
index cc1f3cab2..f6d35772b 100644
--- a/src/OS/os.h-Linux
+++ b/src/OS/os.h-Linux
@@ -79,6 +79,7 @@ then change the 0 to 1 in the next block. */
 #if defined(TCP_FASTOPEN) && !defined(MSG_FASTOPEN)
 # define MSG_FASTOPEN 0x20000000
 #endif
+#define EXIM_HAVE_TCPI_UNACKED
 
 
 /* End */