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diff --git a/gnuradio-runtime/lib/flat_flowgraph.h b/gnuradio-runtime/lib/flat_flowgraph.h
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+++ b/gnuradio-runtime/lib/flat_flowgraph.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2006,2007,2013 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_GR_RUNTIME_FLAT_FLOWGRAPH_H
+#define INCLUDED_GR_RUNTIME_FLAT_FLOWGRAPH_H
+
+#include <gnuradio/api.h>
+#include <gnuradio/flowgraph.h>
+#include <gnuradio/block.h>
+
+namespace gr {
+
+  // Create a shared pointer to a heap allocated gr::flat_flowgraph
+  // (types defined in gr_runtime_types.h)
+  GR_RUNTIME_API flat_flowgraph_sptr make_flat_flowgraph();
+
+  /*!
+   *\brief Class specializing gr_flat_flowgraph that has all nodes
+   * as blocks, with no hierarchy
+   * \ingroup internal
+   */
+  class GR_RUNTIME_API flat_flowgraph : public flowgraph
+  {
+  public:
+    friend GR_RUNTIME_API flat_flowgraph_sptr make_flat_flowgraph();
+
+    // Destruct an arbitrary gr::flat_flowgraph
+    ~flat_flowgraph();
+
+    // Wire list of gr::block together in new flat_flowgraph
+    void setup_connections();
+  
+    // Merge applicable connections from existing flat flowgraph
+    void merge_connections(flat_flowgraph_sptr sfg);
+
+    // Return a string list of edges
+    std::string edge_list();
+
+    void dump();
+
+    /*!
+     * Make a vector of gr::block from a vector of gr::basic_block
+     */
+    static block_vector_t make_block_vector(basic_block_vector_t &blocks);
+
+    void replace_endpoint(const msg_endpoint &e, const msg_endpoint &r, bool is_src);
+    void clear_endpoint(const msg_endpoint &e, bool is_src);
+
+    /*!
+     * Enables export of perf. counters to ControlPort on all blocks in
+     * the flowgraph.
+     */
+    void enable_pc_rpc();
+
+  private:
+    flat_flowgraph();
+
+    block_detail_sptr allocate_block_detail(basic_block_sptr block);
+    buffer_sptr allocate_buffer(basic_block_sptr block, int port);
+    void connect_block_inputs(basic_block_sptr block);
+
+    /* When reusing a flowgraph's blocks, this call makes sure all of
+     * the buffer's are aligned at the machine's alignment boundary
+     * and tells the blocks that they are aligned.
+     *
+     * Called from both setup_connections and merge_connections for
+     * start and restarts.
+     */
+    void setup_buffer_alignment(block_sptr block);
+  };
+
+} /* namespace gr */
+
+#endif /* INCLUDED_GR_RUNTIME_FLAT_FLOWGRAPH_H */