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-rw-r--r--audio/out/ao_jack.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/audio/out/ao_jack.c b/audio/out/ao_jack.c
index 597835c989..b5413f77cf 100644
--- a/audio/out/ao_jack.c
+++ b/audio/out/ao_jack.c
@@ -40,6 +40,10 @@
#include <jack/jack.h>
+#if !HAVE_GPL
+#error GPL only
+#endif
+
struct jack_opts {
char *port;
char *client_name;