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-rw-r--r--audio/out/ao_alsa.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/audio/out/ao_alsa.c b/audio/out/ao_alsa.c
index 900cbafd03..050aef4e2c 100644
--- a/audio/out/ao_alsa.c
+++ b/audio/out/ao_alsa.c
@@ -49,6 +49,10 @@
#include "internal.h"
#include "audio/format.h"
+#if !HAVE_GPL
+#error GPL only
+#endif
+
struct ao_alsa_opts {
char *mixer_device;
char *mixer_name;