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diff --git a/engine/SCons/Tool/latex.py b/engine/SCons/Tool/latex.py
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+"""SCons.Tool.latex
+
+Tool-specific initialization for LaTeX.
+Generates .dvi files from .latex or .ltx files
+
+There normally shouldn't be any need to import this module directly.
+It will usually be imported through the generic SCons.Tool.Tool()
+selection method.
+
+"""
+
+#
+# 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.
+#
+
+__revision__ = "src/engine/SCons/Tool/latex.py 4577 2009/12/27 19:43:56 scons"
+
+import SCons.Action
+import SCons.Defaults
+import SCons.Scanner.LaTeX
+import SCons.Util
+import SCons.Tool
+import SCons.Tool.tex
+
+def LaTeXAuxFunction(target = None, source= None, env=None):
+    result = SCons.Tool.tex.InternalLaTeXAuxAction( SCons.Tool.tex.LaTeXAction, target, source, env )
+    if result != 0:
+        print env['LATEX']," returned an error, check the log file"
+    return result
+
+LaTeXAuxAction = SCons.Action.Action(LaTeXAuxFunction,
+                              strfunction=SCons.Tool.tex.TeXLaTeXStrFunction)
+
+def generate(env):
+    """Add Builders and construction variables for LaTeX to an Environment."""
+
+    env.AppendUnique(LATEXSUFFIXES=SCons.Tool.LaTeXSuffixes)
+
+    import dvi
+    dvi.generate(env)
+
+    import pdf
+    pdf.generate(env)
+
+    bld = env['BUILDERS']['DVI']
+    bld.add_action('.ltx', LaTeXAuxAction)
+    bld.add_action('.latex', LaTeXAuxAction)
+    bld.add_emitter('.ltx', SCons.Tool.tex.tex_eps_emitter)
+    bld.add_emitter('.latex', SCons.Tool.tex.tex_eps_emitter)
+
+    SCons.Tool.tex.generate_common(env)
+
+def exists(env):
+    return env.Detect('latex')
+
+# Local Variables:
+# tab-width:4
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=4 shiftwidth=4: