diff --git a/python/setup.py b/python/setup.py
index 6ea3bad..a9df075 100755
--- a/python/setup.py
+++ b/python/setup.py
@@ -5,6 +5,7 @@
 import os
 import subprocess
 import sys
+import platform
 
 # We must use setuptools, not distutils, because we need to use the
 # namespace_packages option for the "google" package.
@@ -76,7 +77,11 @@
       sys.exit(-1)
 
 def GenerateUnittestProtos():
+  generate_proto("../src/google/protobuf/any_test.proto", False)
+  generate_proto("../src/google/protobuf/map_proto2_unittest.proto", False)
   generate_proto("../src/google/protobuf/map_unittest.proto", False)
+  generate_proto("../src/google/protobuf/test_messages_proto3.proto", False)
+  generate_proto("../src/google/protobuf/test_messages_proto2.proto", False)
   generate_proto("../src/google/protobuf/unittest_arena.proto", False)
   generate_proto("../src/google/protobuf/unittest_no_arena.proto", False)
   generate_proto("../src/google/protobuf/unittest_no_arena_import.proto", False)
@@ -94,6 +99,7 @@
   generate_proto("google/protobuf/internal/descriptor_pool_test2.proto", False)
   generate_proto("google/protobuf/internal/factory_test1.proto", False)
   generate_proto("google/protobuf/internal/factory_test2.proto", False)
+  generate_proto("google/protobuf/internal/file_options_test.proto", False)
   generate_proto("google/protobuf/internal/import_test_package/inner.proto", False)
   generate_proto("google/protobuf/internal/import_test_package/outer.proto", False)
   generate_proto("google/protobuf/internal/missing_enum_values.proto", False)
@@ -101,6 +107,7 @@
   generate_proto("google/protobuf/internal/more_extensions.proto", False)
   generate_proto("google/protobuf/internal/more_extensions_dynamic.proto", False)
   generate_proto("google/protobuf/internal/more_messages.proto", False)
+  generate_proto("google/protobuf/internal/no_package.proto", False)
   generate_proto("google/protobuf/internal/packed_field_test.proto", False)
   generate_proto("google/protobuf/internal/test_bad_identifiers.proto", False)
   generate_proto("google/protobuf/pyext/python.proto", False)
@@ -113,9 +120,7 @@
       for filename in filenames:
         filepath = os.path.join(dirpath, filename)
         if filepath.endswith("_pb2.py") or filepath.endswith(".pyc") or \
-          filepath.endswith(".so") or filepath.endswith(".o") or \
-          filepath.endswith('google/protobuf/compiler/__init__.py') or \
-          filepath.endswith('google/protobuf/util/__init__.py'):
+          filepath.endswith(".so") or filepath.endswith(".o"):
           os.remove(filepath)
     # _clean is an old-style class, so super() doesn't work.
     _clean.run(self)
@@ -137,12 +142,6 @@
     generate_proto("../src/google/protobuf/wrappers.proto")
     GenerateUnittestProtos()
 
-    # Make sure google.protobuf/** are valid packages.
-    for path in ['', 'internal/', 'compiler/', 'pyext/', 'util/']:
-      try:
-        open('google/protobuf/%s__init__.py' % path, 'a').close()
-      except EnvironmentError:
-        pass
     # _build_py is an old-style class, so super() doesn't work.
     _build_py.run(self)
 
@@ -157,33 +156,78 @@
     status = subprocess.check_call(cmd, shell=True)
 
 
+def get_option_from_sys_argv(option_str):
+  if option_str in sys.argv:
+    sys.argv.remove(option_str)
+    return True
+  return False
+
+
 if __name__ == '__main__':
   ext_module_list = []
-  cpp_impl = '--cpp_implementation'
   warnings_as_errors = '--warnings_as_errors'
-  if cpp_impl in sys.argv:
-    sys.argv.remove(cpp_impl)
-    extra_compile_args = ['-Wno-write-strings', '-Wno-invalid-offsetof']
+  if get_option_from_sys_argv('--cpp_implementation'):
+    # Link libprotobuf.a and libprotobuf-lite.a statically with the
+    # extension. Note that those libraries have to be compiled with
+    # -fPIC for this to work.
+    compile_static_ext = get_option_from_sys_argv('--compile_static_extension')
+    libraries = ['protobuf']
+    extra_objects = None
+    if compile_static_ext:
+      libraries = None
+      extra_objects = ['../src/.libs/libprotobuf.a',
+                       '../src/.libs/libprotobuf-lite.a']
     test_conformance.target = 'test_python_cpp'
 
+    extra_compile_args = []
+
+    if sys.platform != 'win32':
+        extra_compile_args.append('-Wno-write-strings')
+        extra_compile_args.append('-Wno-invalid-offsetof')
+        extra_compile_args.append('-Wno-sign-compare')
+
+    # https://github.com/Theano/Theano/issues/4926
+    if sys.platform == 'win32':
+      extra_compile_args.append('-D_hypot=hypot')
+
+    # https://github.com/tpaviot/pythonocc-core/issues/48
+    if sys.platform == 'win32' and  '64 bit' in sys.version:
+      extra_compile_args.append('-DMS_WIN64')
+
+    # MSVS default is dymanic
+    if (sys.platform == 'win32'):
+      extra_compile_args.append('/MT')
+
     if "clang" in os.popen('$CC --version 2> /dev/null').read():
       extra_compile_args.append('-Wno-shorten-64-to-32')
 
+    v, _, _ = platform.mac_ver()
+    if v:
+      extra_compile_args.append('-std=c++11')
+    elif os.getenv('KOKORO_BUILD_NUMBER') or os.getenv('KOKORO_BUILD_ID'):
+      extra_compile_args.append('-std=c++11')
+
     if warnings_as_errors in sys.argv:
       extra_compile_args.append('-Werror')
       sys.argv.remove(warnings_as_errors)
 
     # C++ implementation extension
-    ext_module_list.append(
+    ext_module_list.extend([
         Extension(
             "google.protobuf.pyext._message",
             glob.glob('google/protobuf/pyext/*.cc'),
             include_dirs=[".", "../src"],
-            libraries=['protobuf'],
+            libraries=libraries,
+            extra_objects=extra_objects,
             library_dirs=['../src/.libs'],
             extra_compile_args=extra_compile_args,
-        )
-    )
+        ),
+        Extension(
+            "google.protobuf.internal._api_implementation",
+            glob.glob('google/protobuf/internal/api_implementation.cc'),
+            extra_compile_args=extra_compile_args + ['-DPYTHON_PROTO2_CPP_IMPL_V2'],
+        ),
+    ])
     os.environ['PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION'] = 'cpp'
 
   # Keep this list of dependencies in sync with tox.ini.
@@ -196,15 +240,15 @@
       name='protobuf',
       version=GetVersion(),
       description='Protocol Buffers',
+      download_url='https://github.com/google/protobuf/releases',
       long_description="Protocol Buffers are Google's data interchange format",
       url='https://developers.google.com/protocol-buffers/',
       maintainer='protobuf@googlegroups.com',
       maintainer_email='protobuf@googlegroups.com',
-      license='New BSD License',
+      license='3-Clause BSD License',
       classifiers=[
         "Programming Language :: Python",
         "Programming Language :: Python :: 2",
-        "Programming Language :: Python :: 2.6",
         "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.3",