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-rw-r--r--src/core/ao_stdio.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/core/ao_stdio.c b/src/core/ao_stdio.c
index cd144d6b..99118137 100644
--- a/src/core/ao_stdio.c
+++ b/src/core/ao_stdio.c
@@ -51,6 +51,9 @@
#ifndef USE_SERIAL_9_STDIN
#define USE_SERIAL_9_STDIN 0
#endif
+#ifndef PACKET_HAS_SLAVE
+#define PACKET_HAS_SLAVE 0
+#endif
#define USE_SERIAL_STDIN (USE_SERIAL_0_STDIN + \
USE_SERIAL_1_STDIN + \