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-rw-r--r--libao2/audio_out.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/libao2/audio_out.h b/libao2/audio_out.h
index 353b5a4d71..4765a6562d 100644
--- a/libao2/audio_out.h
+++ b/libao2/audio_out.h
@@ -1,3 +1,7 @@
+
+#ifndef __AUDIO_OUT_H
+#define __AUDIO_OUT_H
+
typedef struct ao_info_s
{
/* driver name ("Matrox Millennium G200/G400" */
@@ -68,4 +72,4 @@ typedef struct ao_control_vol_s {
float right;
} ao_control_vol_t;
-
+#endif