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-rw-r--r--src/src/functions.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/src/functions.h b/src/src/functions.h
index 9d1f6dc6e..e9f71c984 100644
--- a/src/src/functions.h
+++ b/src/src/functions.h
@@ -474,6 +474,9 @@ extern int strcmpic(const uschar *, const uschar *);
extern int strncmpic(const uschar *, const uschar *, int);
extern uschar *strstric(uschar *, uschar *, BOOL);
+#ifdef EXIM_TFO_PROBE
+extern void tfo_probe(void);
+#endif
extern void timesince(struct timeval * diff, struct timeval * then);
extern void tls_modify_variables(tls_support *);
extern uschar *tod_stamp(int);