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diff --git a/gr-audio/lib/osx/osx_sink.h b/gr-audio/lib/osx/osx_sink.h
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+++ b/gr-audio/lib/osx/osx_sink.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2006-2011,2013 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio.
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_AUDIO_OSX_SINK_H
+#define INCLUDED_AUDIO_OSX_SINK_H
+
+#include <audio/sink.h>
+#include <string>
+#include <list>
+#include <AudioUnit/AudioUnit.h>
+#include <circular_buffer.h>
+
+namespace gr {
+  namespace audio {
+
+    /*!
+     * \brief audio sink using OSX
+     * \ingroup audio_blk
+     *
+     * input signature is one or two streams of floats.
+     * Input samples must be in the range [-1,1].
+     */
+
+    class osx_sink : public sink
+    {
+      Float64 d_sample_rate;
+      int     d_channel_config;
+      UInt32  d_n_channels;
+      UInt32  d_queueSampleCount, d_max_sample_count;
+      bool    d_do_block;
+      gruel::mutex* d_internal;
+      gruel::condition_variable* d_cond_data;
+      circular_buffer<float>** d_buffers;
+
+      // AudioUnits and Such
+      AudioUnit d_OutputAU;
+
+    public:
+      osx_sink(int sample_rate = 44100,
+               const std::string device_name = "2",
+               bool do_block = true,
+               int channel_config = -1,
+               int max_sample_count = -1);
+
+      ~osx_sink();
+
+      bool IsRunning();
+      bool start();
+      bool stop();
+
+      int work(int noutput_items,
+               gr_vector_const_void_star &input_items,
+               gr_vector_void_star &output_items);
+
+    private:
+      static OSStatus AUOutputCallback(void *inRefCon,
+                                       AudioUnitRenderActionFlags *ioActionFlags,
+                                       const AudioTimeStamp *inTimeStamp,
+                                       UInt32 inBusNumber,
+                                       UInt32 inNumberFrames,
+                                       AudioBufferList *ioData);
+    };
+
+  } /* namespace audio */
+} /* namespace gr */
+
+#endif /* INCLUDED_AUDIO_OSX_SINK_H */