X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/ac0dcd3f05a8821d7ce042646472be1995a08042..f38a45371faa9f914ef69b57cbf1890c609b81cd:/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 */