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diff --git a/src/engine/SCons/Tool/tex.py b/src/engine/SCons/Tool/tex.py
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+++ b/src/engine/SCons/Tool/tex.py
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+"""SCons.Tool.tex
+
+Tool-specific initialization for TeX.
+
+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 Steven Knight
+#
+# 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__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
+
+import SCons.Defaults
+
+def generate(env, platform):
+    """Add Builders and construction variables for TeX to an Environment."""
+    try:
+        bld = env['BUILDERS']['DVI']
+    except KeyError:
+        bld = SCons.Defaults.DVI()
+        env['BUILDERS']['DVI'] = bld
+        
+    bld.add_action('.tex', '$TEXCOM')
+
+    env['TEX']      = 'tex'
+    env['TEXFLAGS'] = ''
+    env['TEXCOM']   = '$TEX $TEXFLAGS $SOURCES'