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-rw-r--r--stream/audio_in.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/stream/audio_in.h b/stream/audio_in.h
index 28d7d335cf..6b714f7306 100644
--- a/stream/audio_in.h
+++ b/stream/audio_in.h
@@ -24,6 +24,10 @@
#include "config.h"
+#if !HAVE_GPL
+#error GPL only
+#endif
+
struct mp_log;
#if HAVE_ALSA