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+<!--
+
+  Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation
+
+  Permission is hereby granted, free of charge, to any person obtaining
+  a copy of this software and associated documentation files (the
+  "Software"), to deal in the Software without restriction, including
+  without limitation the rights to use, copy, modify, merge, publish,
+  distribute, sublicense, and/or sell copies of the Software, and to
+  permit persons to whom the Software is furnished to do so, subject to
+  the following conditions:
+
+  The above copyright notice and this permission notice shall be included
+  in all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+  KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+  WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+-->
+
+<para>
+
+This appendix contains descriptions of all of the
+construction variables that are <emphasis>potentially</emphasis>
+available "out of the box" in this version of SCons.
+Whether or not setting a construction variable
+in a construction environment
+will actually have an effect depends on
+whether any of the Tools and/or Builders
+that use the variable have been
+included in the construction environment.
+
+</para>
+
+<para>
+
+In this appendix, we have
+appended the initial <envar>$</envar>
+(dollar sign) to the beginning of each
+variable name when it appears in the text,
+but left off the dollar sign
+in the left-hand column
+where the name appears for each entry.
+
+</para>
+
+<variablelist>
+
+&variables-gen;
+
+</variablelist>