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diff --git a/src/google/protobuf/compiler/main.cc b/src/google/protobuf/compiler/main.cc
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// 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.
+
+// Author: kenton@google.com (Kenton Varda)
+
+#include <google/protobuf/compiler/command_line_interface.h>
+#include <google/protobuf/compiler/cpp/cpp_generator.h>
+#include <google/protobuf/compiler/python/python_generator.h>
+#include <google/protobuf/compiler/java/java_generator.h>
+
+
+int main(int argc, char* argv[]) {
+
+  google::protobuf::compiler::CommandLineInterface cli;
+
+  // Proto2 C++
+  google::protobuf::compiler::cpp::CppGenerator cpp_generator;
+  cli.RegisterGenerator("--cpp_out", &cpp_generator,
+                        "Generate C++ header and source.");
+
+  // Proto2 Java
+  google::protobuf::compiler::java::JavaGenerator java_generator;
+  cli.RegisterGenerator("--java_out", &java_generator,
+                        "Generate Java source file.");
+
+
+  // Proto2 Python
+  google::protobuf::compiler::python::Generator py_generator;
+  cli.RegisterGenerator("--python_out", &py_generator,
+                        "Generate Python source file.");
+
+  return cli.Run(argc, argv);
+}