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diff --git a/gnuradio-runtime/lib/gr_flat_flowgraph.h b/gnuradio-runtime/lib/gr_flat_flowgraph.h
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+++ b/gnuradio-runtime/lib/gr_flat_flowgraph.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2006,2007 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_FLAT_FLOWGRAPH_H
+#define INCLUDED_GR_FLAT_FLOWGRAPH_H
+
+#include <gr_runtime_api.h>
+#include <gr_flowgraph.h>
+#include <gr_block.h>
+
+// Create a shared pointer to a heap allocated gr_flat_flowgraph
+// (types defined in gr_runtime_types.h)
+GR_RUNTIME_API gr_flat_flowgraph_sptr gr_make_flat_flowgraph();
+
+/*!
+ *\brief Class specializing gr_flat_flowgraph that has all nodes
+ * as gr_blocks, with no hierarchy
+ * \ingroup internal
+ */
+class GR_RUNTIME_API gr_flat_flowgraph : public gr_flowgraph
+{
+public:
+  friend GR_RUNTIME_API gr_flat_flowgraph_sptr gr_make_flat_flowgraph();
+
+  // Destruct an arbitrary gr_flat_flowgraph
+  ~gr_flat_flowgraph();
+
+  // Wire gr_blocks together in new flat_flowgraph
+  void setup_connections();
+  
+  // Merge applicable connections from existing flat flowgraph
+  void merge_connections(gr_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 gr_block_vector_t make_block_vector(gr_basic_block_vector_t &blocks);
+
+  void replace_endpoint(const gr_msg_endpoint &e, const gr_msg_endpoint &r, bool is_src);
+  void clear_endpoint(const gr_msg_endpoint &e, bool is_src);
+
+  /*!
+   * Enables export of perf. counters to ControlPort on all blocks in
+   * the flowgraph.
+   */
+  void enable_pc_rpc();
+
+private:
+  gr_flat_flowgraph();
+
+  gr_block_detail_sptr allocate_block_detail(gr_basic_block_sptr block);
+  gr_buffer_sptr allocate_buffer(gr_basic_block_sptr block, int port);
+  void connect_block_inputs(gr_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(gr_block_sptr block);
+};
+
+#endif /* INCLUDED_GR_FLAT_FLOWGRAPH_H */