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diff --git a/site_scons/site_tools/concat_source.py b/site_scons/site_tools/concat_source.py
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+#!/usr/bin/python2.4
+# Copyright 2008, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Source concatenation builder for SCons."""
+
+
+import SCons.Script
+
+
+def ConcatSourceBuilder(target, source, env):
+  """ConcatSource builder.
+
+  Args:
+    target: List of target nodes
+    source: List of source nodes
+    env: Environment in which to build
+
+  Returns:
+    None if successful; 1 if error.
+  """
+  if len(target) != 1:
+    print 'ERROR: multiple ConcatSource targets when 1 expected'
+    return 1
+
+  output_lines = [
+      '// This file is auto-generated by the ConcatSource builder.']
+
+  for source_file in source:
+    # Skip source files which are not CPP files.  These will be passed through
+    # to the output list by the pseudo-builder.
+    if source_file.suffix not in env['CONCAT_SOURCE_SUFFIXES']:
+      continue
+
+    source_path = str(source_file)
+
+    if 'msvc' in env['TOOLS']:
+      # Add message pragma for nicer progress indication when building with
+      # MSVC.
+      output_lines.append('#pragma message("--%s")' % (
+          source_path.replace("\\", "/")))
+
+    output_lines.append('#include "%s"' % source_path)
+
+  # Need an EOL at the end of the file for more finicky build tools
+  output_lines.append('\n')
+
+  output_file = open(str(target[0]), 'w')
+  output_file.write('\n'.join(output_lines))
+  output_file.close()
+
+
+def ConcatSourcePseudoBuilder(self, target, source):
+  """ConcatSource pseudo-builder; calls builder or passes through source nodes.
+
+  Args:
+    self: Environment in which to build
+    target: List of target nodes
+    source: List of source nodes
+
+  Returns:
+    If self['CONCAT_SOURCE_ENABLE'], calls self.ConcatSource and returns
+    the list of target nodes.  Otherwise, returns the list of source nodes.
+    Source nodes which are not CPP files are passed through unchanged to the
+    list of output nodes.
+  """
+  if self.get('CONCAT_SOURCE_ENABLE', True):
+    # Scan down source list and separate CPP sources (which we concatenate)
+    # from other files (which we pass through).
+    cppsource = []
+    outputs = []
+    for source_file in SCons.Script.Flatten(source):
+      if self.File(source_file).suffix in self['CONCAT_SOURCE_SUFFIXES']:
+        cppsource.append(source_file)
+      else:
+        outputs.append(source_file)
+
+    if len(cppsource) > 1:
+      # More than one file, so concatenate them together
+      outputs += self.ConcatSourceBuilder(target, cppsource)
+    else:
+      # <2 files, so pass them through; no need for a ConcatSource target
+      outputs += cppsource
+    return outputs
+  else:
+    # ConcatSource is disabled, so pass through the list of source nodes.
+    return source
+
+
+def generate(env):
+  # NOTE: SCons requires the use of this name, which fails gpylint.
+  """SCons entry point for this tool."""
+
+  # Add the builder
+  action = SCons.Script.Action(ConcatSourceBuilder,
+                               varlist = ['CONCAT_SOURCE_SUFFIXES'])
+  builder = SCons.Script.Builder(action = action, suffix = '$CXXFILESUFFIX')
+  env.Append(BUILDERS={'ConcatSourceBuilder': builder})
+
+  # Suffixes of sources we can concatenate.  Files not in this list will be
+  # passed through untouched.  (Note that on Mac, Objective C/C++ files
+  # cannot be concatenated with regular C/C++ files.)
+  # TODO(rspangler): Probably shouldn't mix C, C++ either...
+  env['CONCAT_SOURCE_SUFFIXES'] = ['.c', '.C', '.cxx', '.cpp', '.c++', '.cc',
+                                   '.h', '.H', '.hxx', '.hpp', '.hh']
+
+  # Add a psuedo-builder method which can look at the environment to determine
+  # whether to call the ConcatSource builder or not
+  env.AddMethod(ConcatSourcePseudoBuilder, 'ConcatSource')