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-rw-r--r--src/OS/os.h-Linux2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/OS/os.h-Linux b/src/OS/os.h-Linux
index 510865c66..cc1cef99b 100644
--- a/src/OS/os.h-Linux
+++ b/src/OS/os.h-Linux
@@ -69,6 +69,8 @@ then change the 0 to 1 in the next block. */
# define EXIM_HAVE_OPENAT
#endif
+#include <netinet/tcp.h> /* for TCP_FASTOPEN */
+#include <sys/socket.h> /* for MSG_FASTOPEN */
#if defined(TCP_FASTOPEN) && !defined(MSG_FASTOPEN)
# define MSG_FASTOPEN 0x20000000
#endif