Fix warning unused parameter 'reply_timestamp' under macOS

diff --git a/src/fping.c b/src/fping.c
index 709ae62018692fe842aceacd58a0c4faeeb3a84d..6245cb6c8b8869df4bf1b9214fbb009a3db8f596 100644 (file)
--- a/src/fping.c
+++ b/src/fping.c
@@ -2028,7 +2028,11 @@ select_again:
 }
 
 int receive_packet(int64_t wait_time,
+#if HAVE_SO_TIMESTAMPNS
     int64_t *reply_timestamp,
+#else
+    int64_t *reply_timestamp __attribute__((unused)),
+#endif
     struct sockaddr *reply_src_addr,
     size_t reply_src_addr_len,
     char *reply_buf,