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diff --git a/Source/cmAddSubDirectoryCommand.h b/Source/cmAddSubDirectoryCommand.h
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+++ b/Source/cmAddSubDirectoryCommand.h
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+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#ifndef cmAddSubDirectoryCommand_h
+#define cmAddSubDirectoryCommand_h
+
+#include "cmCommand.h"
+
+/** \class cmAddSubDirectoryCommand
+ * \brief Specify a subdirectory to build
+ *
+ * cmAddSubDirectoryCommand specifies a subdirectory to process
+ * by CMake. CMake will descend
+ * into the specified source directory and process any CMakeLists.txt found.
+ */
+class cmAddSubDirectoryCommand : public cmCommand
+{
+public:
+  /**
+   * This is a virtual constructor for the command.
+   */
+  virtual cmCommand* Clone()
+    {
+    return new cmAddSubDirectoryCommand;
+    }
+
+  /**
+   * This is called when the command is first encountered in
+   * the CMakeLists.txt file.
+   */
+  virtual bool InitialPass(std::vector<std::string> const& args,
+                           cmExecutionStatus &status);
+
+  /**
+   * The name of the command as specified in CMakeList.txt.
+   */
+  virtual const char* GetName() const { return "add_subdirectory";}
+
+  /**
+   * Succinct documentation.
+   */
+  virtual const char* GetTerseDocumentation() const
+    {
+    return "Add a subdirectory to the build.";
+    }
+
+  /**
+   * More documentation.
+   */
+  virtual const char* GetFullDocumentation() const
+    {
+    return
+      "  add_subdirectory(source_dir [binary_dir] \n"
+      "                   [EXCLUDE_FROM_ALL])\n"
+      "Add a subdirectory to the build. The source_dir specifies the "
+      "directory in which the source CMakeLists.txt and code files are "
+      "located. If it is a relative "
+      "path it will be evaluated with respect to the current "
+      "directory (the typical usage), but it may also be an absolute path. "
+      "The binary_dir specifies the directory in which to place the output "
+      "files. If it is a relative path it will be evaluated with respect "
+      "to the current output directory, but it may also be an absolute "
+      "path. If binary_dir is not specified, the value of source_dir, "
+      "before expanding any relative path, will be used (the typical usage). "
+      "The CMakeLists.txt file in the specified source directory will "
+      "be processed immediately by CMake before processing in the current "
+      "input file continues beyond this command.\n"
+
+      "If the EXCLUDE_FROM_ALL argument is provided then targets in the "
+      "subdirectory will not be included in the ALL target of the parent "
+      "directory by default, and will be excluded from IDE project files.  "
+      "Users must explicitly build targets in the subdirectory.  "
+      "This is meant for use when the subdirectory contains a separate part "
+      "of the project that is useful but not necessary, such as a set of "
+      "examples.  "
+      "Typically the subdirectory should contain its own project() command "
+      "invocation so that a full build system will be generated in the "
+      "subdirectory (such as a VS IDE solution file).  "
+      "Note that inter-target dependencies supercede this exclusion.  "
+      "If a target built by the parent project depends on a target in the "
+      "subdirectory, the dependee target will be included in the parent "
+      "project build system to satisfy the dependency."
+      ;
+    }
+
+  cmTypeMacro(cmAddSubDirectoryCommand, cmCommand);
+};
+
+
+
+#endif