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diff --git a/src/engine/SCons/Tool/yacc.xml b/src/engine/SCons/Tool/yacc.xml
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+<!--
+Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation
+
+This file is processed by the bin/SConsDoc.py module.
+See its __doc__ string for a discussion of the format.
+-->
+<tool name="yacc">
+<summary>
+Sets construction variables for the &yacc; parse generator.
+</summary>
+<sets>
+YACC
+YACCFLAGS
+YACCCOM
+YACCHFILESUFFIX
+YACCHXXFILESUFFIX
+YACCVCGFILESUFFIX
+</sets>
+<uses>
+YACCCOMSTR
+</uses>
+</tool>
+
+<cvar name="YACC">
+<summary>
+The parser generator.
+</summary>
+</cvar>
+
+<cvar name="YACCCOM">
+<summary>
+The command line used to call the parser generator
+to generate a source file.
+</summary>
+</cvar>
+
+<cvar name="YACCCOMSTR">
+<summary>
+The string displayed when generating a source file
+using the parser generator.
+If this is not set, then &cv-link-YACCCOM; (the command line) is displayed.
+
+<example>
+env = Environment(YACCCOMSTR = "Yacc'ing $TARGET from $SOURCES")
+</example>
+</summary>
+</cvar>
+
+<cvar name="YACCFLAGS">
+<summary>
+General options passed to the parser generator.
+If &cv-link-YACCFLAGS; contains a <option>-d</option> option,
+SCons assumes that the call will also create a .h file
+(if the yacc source file ends in a .y suffix)
+or a .hpp file
+(if the yacc source file ends in a .yy suffix)
+</summary>
+</cvar>
+
+<cvar name="YACCHFILESUFFIX">
+<summary>
+The suffix of the C
+header file generated by the parser generator
+when the
+<option>-d</option>
+option is used.
+Note that setting this variable does not cause
+the parser generator to generate a header
+file with the specified suffix,
+it exists to allow you to specify
+what suffix the parser generator will use of its own accord.
+The default value is
+<filename>.h</filename>.
+</summary>
+</cvar>
+
+<cvar name="YACCHXXFILESUFFIX">
+<summary>
+The suffix of the C++
+header file generated by the parser generator
+when the
+<option>-d</option>
+option is used.
+Note that setting this variable does not cause
+the parser generator to generate a header
+file with the specified suffix,
+it exists to allow you to specify
+what suffix the parser generator will use of its own accord.
+The default value is
+<filename>.hpp</filename>,
+except on Mac OS X,
+where the default is
+<filename>${TARGET.suffix}.h</filename>.
+because the default &bison; parser generator just
+appends <filename>.h</filename>
+to the name of the generated C++ file.
+</summary>
+</cvar>
+
+<cvar name="YACCVCGFILESUFFIX">
+<summary>
+The suffix of the file
+containing the VCG grammar automaton definition
+when the
+<option>--graph=</option>
+option is used.
+Note that setting this variable does not cause
+the parser generator to generate a VCG
+file with the specified suffix,
+it exists to allow you to specify
+what suffix the parser generator will use of its own accord.
+The default value is
+<filename>.vcg</filename>.
+</summary>
+</cvar>