// The idiosyncrasies of GSM-in-WAV are explained at http://kbs.cs.tu-berlin.de/~jutta/toast.html
+#include "config.h"
+#if HAVE_GSM_H
+#include <gsm.h>
+#else
#include <gsm/gsm.h>
+#endif
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"