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diff --git a/src/engine/SCons/Tool/pdftex.py b/src/engine/SCons/Tool/pdftex.py
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+++ b/src/engine/SCons/Tool/pdftex.py
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+"""SCons.Tool.pdftex
+
+Tool-specific initialization for pdftex.
+Generates .pdf files from .tex 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/pdftex.py 4577 2009/12/27 19:44:43 scons"
+
+import os
+import SCons.Action
+import SCons.Util
+import SCons.Tool.tex
+
+PDFTeXAction = None
+
+# This action might be needed more than once if we are dealing with
+# labels and bibtex.
+PDFLaTeXAction = None
+
+def PDFLaTeXAuxAction(target = None, source= None, env=None):
+    result = SCons.Tool.tex.InternalLaTeXAuxAction( PDFLaTeXAction, target, source, env )
+    return result
+
+def PDFTeXLaTeXFunction(target = None, source= None, env=None):
+    """A builder for TeX and LaTeX that scans the source file to
+    decide the "flavor" of the source and then executes the appropriate
+    program."""
+    basedir = os.path.split(str(source[0]))[0]
+    abspath = os.path.abspath(basedir)
+
+    if SCons.Tool.tex.is_LaTeX(source,env,abspath):
+        result = PDFLaTeXAuxAction(target,source,env)
+        if result != 0:
+            print env['PDFLATEX']," returned an error, check the log file"
+    else:
+        result = PDFTeXAction(target,source,env)
+        if result != 0:
+            print env['PDFTEX']," returned an error, check the log file"
+    return result
+
+PDFTeXLaTeXAction = None
+
+def generate(env):
+    """Add Builders and construction variables for pdftex to an Environment."""
+    global PDFTeXAction
+    if PDFTeXAction is None:
+        PDFTeXAction = SCons.Action.Action('$PDFTEXCOM', '$PDFTEXCOMSTR')
+
+    global PDFLaTeXAction
+    if PDFLaTeXAction is None:
+        PDFLaTeXAction = SCons.Action.Action("$PDFLATEXCOM", "$PDFLATEXCOMSTR")
+
+    global PDFTeXLaTeXAction
+    if PDFTeXLaTeXAction is None:
+        PDFTeXLaTeXAction = SCons.Action.Action(PDFTeXLaTeXFunction,
+                              strfunction=SCons.Tool.tex.TeXLaTeXStrFunction)
+
+    env.AppendUnique(LATEXSUFFIXES=SCons.Tool.LaTeXSuffixes)
+
+    import pdf
+    pdf.generate(env)
+
+    bld = env['BUILDERS']['PDF']
+    bld.add_action('.tex', PDFTeXLaTeXAction)
+    bld.add_emitter('.tex', SCons.Tool.tex.tex_pdf_emitter)
+
+    # Add the epstopdf builder after the pdftex builder 
+    # so pdftex is the default for no source suffix
+    pdf.generate2(env)
+
+    SCons.Tool.tex.generate_common(env)
+
+def exists(env):
+    return env.Detect('pdftex')
+
+# Local Variables:
+# tab-width:4
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=4 shiftwidth=4: