diff --git a/Lib/distutils/tests/setuptools_build_ext.py b/Lib/distutils/tests/setuptools_build_ext.py
new file mode 100644
index 0000000..21fa9e8
--- /dev/null
+++ b/Lib/distutils/tests/setuptools_build_ext.py
@@ -0,0 +1,287 @@
+from distutils.command.build_ext import build_ext as _du_build_ext
+try:
+    # Attempt to use Pyrex for building extensions, if available
+    from Pyrex.Distutils.build_ext import build_ext as _build_ext
+except ImportError:
+    _build_ext = _du_build_ext
+
+import os, sys
+from distutils.file_util import copy_file
+
+from distutils.tests.setuptools_extension import Library
+
+from distutils.ccompiler import new_compiler
+from distutils.sysconfig import customize_compiler, get_config_var
+get_config_var("LDSHARED")  # make sure _config_vars is initialized
+from distutils.sysconfig import _config_vars
+from distutils import log
+from distutils.errors import *
+
+have_rtld = False
+use_stubs = False
+libtype = 'shared'
+
+if sys.platform == "darwin":
+    use_stubs = True
+elif os.name != 'nt':
+    try:
+        from dl import RTLD_NOW
+        have_rtld = True
+        use_stubs = True
+    except ImportError:
+        pass
+
+def if_dl(s):
+    if have_rtld:
+        return s
+    return ''
+
+
+
+
+
+
+class build_ext(_build_ext):
+    def run(self):
+        """Build extensions in build directory, then copy if --inplace"""
+        old_inplace, self.inplace = self.inplace, 0
+        _build_ext.run(self)
+        self.inplace = old_inplace
+        if old_inplace:
+            self.copy_extensions_to_source()
+
+    def copy_extensions_to_source(self):
+        build_py = self.get_finalized_command('build_py')
+        for ext in self.extensions:
+            fullname = self.get_ext_fullname(ext.name)
+            filename = self.get_ext_filename(fullname)
+            modpath = fullname.split('.')
+            package = '.'.join(modpath[:-1])
+            package_dir = build_py.get_package_dir(package)
+            dest_filename = os.path.join(package_dir,os.path.basename(filename))
+            src_filename = os.path.join(self.build_lib,filename)
+
+            # Always copy, even if source is older than destination, to ensure
+            # that the right extensions for the current Python/platform are
+            # used.
+            copy_file(
+                src_filename, dest_filename, verbose=self.verbose,
+                dry_run=self.dry_run
+            )
+            if ext._needs_stub:
+                self.write_stub(package_dir or os.curdir, ext, True)
+
+
+    if _build_ext is not _du_build_ext and not hasattr(_build_ext,'pyrex_sources'):
+        # Workaround for problems using some Pyrex versions w/SWIG and/or 2.4
+        def swig_sources(self, sources, *otherargs):
+            # first do any Pyrex processing
+            sources = _build_ext.swig_sources(self, sources) or sources
+            # Then do any actual SWIG stuff on the remainder
+            return _du_build_ext.swig_sources(self, sources, *otherargs)
+
+
+
+    def get_ext_filename(self, fullname):
+        filename = _build_ext.get_ext_filename(self,fullname)
+        ext = self.ext_map[fullname]
+        if isinstance(ext,Library):
+            fn, ext = os.path.splitext(filename)
+            return self.shlib_compiler.library_filename(fn,libtype)
+        elif use_stubs and ext._links_to_dynamic:
+            d,fn = os.path.split(filename)
+            return os.path.join(d,'dl-'+fn)
+        else:
+            return filename
+
+    def initialize_options(self):
+        _build_ext.initialize_options(self)
+        self.shlib_compiler = None
+        self.shlibs = []
+        self.ext_map = {}
+
+    def finalize_options(self):
+        _build_ext.finalize_options(self)
+        self.extensions = self.extensions or []
+        self.check_extensions_list(self.extensions)
+        self.shlibs = [ext for ext in self.extensions
+                        if isinstance(ext,Library)]
+        if self.shlibs:
+            self.setup_shlib_compiler()
+        for ext in self.extensions:
+            ext._full_name = self.get_ext_fullname(ext.name)
+        for ext in self.extensions:
+            fullname = ext._full_name
+            self.ext_map[fullname] = ext
+            ltd = ext._links_to_dynamic = \
+                self.shlibs and self.links_to_dynamic(ext) or False
+            ext._needs_stub = ltd and use_stubs and not isinstance(ext,Library)
+            filename = ext._file_name = self.get_ext_filename(fullname)
+            libdir = os.path.dirname(os.path.join(self.build_lib,filename))
+            if ltd and libdir not in ext.library_dirs:
+                ext.library_dirs.append(libdir)
+            if ltd and use_stubs and os.curdir not in ext.runtime_library_dirs:
+                ext.runtime_library_dirs.append(os.curdir)
+
+    def setup_shlib_compiler(self):
+        compiler = self.shlib_compiler = new_compiler(
+            compiler=self.compiler, dry_run=self.dry_run, force=self.force
+        )
+        if sys.platform == "darwin":
+            tmp = _config_vars.copy()
+            try:
+                # XXX Help!  I don't have any idea whether these are right...
+                _config_vars['LDSHARED'] = "gcc -Wl,-x -dynamiclib -undefined dynamic_lookup"
+                _config_vars['CCSHARED'] = " -dynamiclib"
+                _config_vars['SO'] = ".dylib"
+                customize_compiler(compiler)
+            finally:
+                _config_vars.clear()
+                _config_vars.update(tmp)
+        else:
+            customize_compiler(compiler)
+
+        if self.include_dirs is not None:
+            compiler.set_include_dirs(self.include_dirs)
+        if self.define is not None:
+            # 'define' option is a list of (name,value) tuples
+            for (name,value) in self.define:
+                compiler.define_macro(name, value)
+        if self.undef is not None:
+            for macro in self.undef:
+                compiler.undefine_macro(macro)
+        if self.libraries is not None:
+            compiler.set_libraries(self.libraries)
+        if self.library_dirs is not None:
+            compiler.set_library_dirs(self.library_dirs)
+        if self.rpath is not None:
+            compiler.set_runtime_library_dirs(self.rpath)
+        if self.link_objects is not None:
+            compiler.set_link_objects(self.link_objects)
+
+        # hack so distutils' build_extension() builds a library instead
+        compiler.link_shared_object = link_shared_object.__get__(compiler)
+
+
+
+    def get_export_symbols(self, ext):
+        if isinstance(ext,Library):
+            return ext.export_symbols
+        return _build_ext.get_export_symbols(self,ext)
+
+    def build_extension(self, ext):
+        _compiler = self.compiler
+        try:
+            if isinstance(ext,Library):
+                self.compiler = self.shlib_compiler
+            _build_ext.build_extension(self,ext)
+            if ext._needs_stub:
+                self.write_stub(
+                    self.get_finalized_command('build_py').build_lib, ext
+                )
+        finally:
+            self.compiler = _compiler
+
+    def links_to_dynamic(self, ext):
+        """Return true if 'ext' links to a dynamic lib in the same package"""
+        # XXX this should check to ensure the lib is actually being built
+        # XXX as dynamic, and not just using a locally-found version or a
+        # XXX static-compiled version
+        libnames = dict.fromkeys([lib._full_name for lib in self.shlibs])
+        pkg = '.'.join(ext._full_name.split('.')[:-1]+[''])
+        for libname in ext.libraries:
+            if pkg+libname in libnames: return True
+        return False
+
+    def get_outputs(self):
+        outputs = _build_ext.get_outputs(self)
+        optimize = self.get_finalized_command('build_py').optimize
+        for ext in self.extensions:
+            if ext._needs_stub:
+                base = os.path.join(self.build_lib, *ext._full_name.split('.'))
+                outputs.append(base+'.py')
+                outputs.append(base+'.pyc')
+                if optimize:
+                    outputs.append(base+'.pyo')
+        return outputs
+
+    def write_stub(self, output_dir, ext, compile=False):
+        log.info("writing stub loader for %s to %s",ext._full_name, output_dir)
+        stub_file = os.path.join(output_dir, *ext._full_name.split('.'))+'.py'
+        if compile and os.path.exists(stub_file):
+            raise DistutilsError(stub_file+" already exists! Please delete.")
+        if not self.dry_run:
+            f = open(stub_file,'w')
+            f.write('\n'.join([
+                "def __bootstrap__():",
+                "   global __bootstrap__, __file__, __loader__",
+                "   import sys, os, pkg_resources, imp"+if_dl(", dl"),
+                "   __file__ = pkg_resources.resource_filename(__name__,%r)"
+                   % os.path.basename(ext._file_name),
+                "   del __bootstrap__",
+                "   if '__loader__' in globals():",
+                "       del __loader__",
+                if_dl("   old_flags = sys.getdlopenflags()"),
+                "   old_dir = os.getcwd()",
+                "   try:",
+                "     os.chdir(os.path.dirname(__file__))",
+                if_dl("     sys.setdlopenflags(dl.RTLD_NOW)"),
+                "     imp.load_dynamic(__name__,__file__)",
+                "   finally:",
+                if_dl("     sys.setdlopenflags(old_flags)"),
+                "     os.chdir(old_dir)",
+                "__bootstrap__()",
+                "" # terminal \n
+            ]))
+            f.close()
+        if compile:
+            from distutils.util import byte_compile
+            byte_compile([stub_file], optimize=0,
+                         force=True, dry_run=self.dry_run)
+            optimize = self.get_finalized_command('install_lib').optimize
+            if optimize > 0:
+                byte_compile([stub_file], optimize=optimize,
+                             force=True, dry_run=self.dry_run)
+            if os.path.exists(stub_file) and not self.dry_run:
+                os.unlink(stub_file)
+
+
+if use_stubs or os.name=='nt':
+    # Build shared libraries
+    #
+    def link_shared_object(self, objects, output_libname, output_dir=None,
+        libraries=None, library_dirs=None, runtime_library_dirs=None,
+        export_symbols=None, debug=0, extra_preargs=None,
+        extra_postargs=None, build_temp=None, target_lang=None
+    ):  self.link(
+            self.SHARED_LIBRARY, objects, output_libname,
+            output_dir, libraries, library_dirs, runtime_library_dirs,
+            export_symbols, debug, extra_preargs, extra_postargs,
+            build_temp, target_lang
+        )
+else:
+    # Build static libraries everywhere else
+    libtype = 'static'
+
+    def link_shared_object(self, objects, output_libname, output_dir=None,
+        libraries=None, library_dirs=None, runtime_library_dirs=None,
+        export_symbols=None, debug=0, extra_preargs=None,
+        extra_postargs=None, build_temp=None, target_lang=None
+    ):
+        # XXX we need to either disallow these attrs on Library instances,
+        #     or warn/abort here if set, or something...
+        #libraries=None, library_dirs=None, runtime_library_dirs=None,
+        #export_symbols=None, extra_preargs=None, extra_postargs=None,
+        #build_temp=None
+
+        assert output_dir is None   # distutils build_ext doesn't pass this
+        output_dir,filename = os.path.split(output_libname)
+        basename, ext = os.path.splitext(filename)
+        if self.library_filename("x").startswith('lib'):
+            # strip 'lib' prefix; this is kludgy if some platform uses
+            # a different prefix
+            basename = basename[3:]
+
+        self.create_static_lib(
+            objects, basename, output_dir, debug, target_lang
+        )
diff --git a/Lib/distutils/tests/setuptools_extension.py b/Lib/distutils/tests/setuptools_extension.py
new file mode 100644
index 0000000..ec6b690
--- /dev/null
+++ b/Lib/distutils/tests/setuptools_extension.py
@@ -0,0 +1,51 @@
+from distutils.core import Extension as _Extension
+from distutils.core import Distribution as _Distribution
+
+def _get_unpatched(cls):
+    """Protect against re-patching the distutils if reloaded
+
+    Also ensures that no other distutils extension monkeypatched the distutils
+    first.
+    """
+    while cls.__module__.startswith('setuptools'):
+        cls, = cls.__bases__
+    if not cls.__module__.startswith('distutils'):
+        raise AssertionError(
+            "distutils has already been patched by %r" % cls
+        )
+    return cls
+
+_Distribution = _get_unpatched(_Distribution)
+_Extension = _get_unpatched(_Extension)
+
+try:
+    from Pyrex.Distutils.build_ext import build_ext
+except ImportError:
+    have_pyrex = False
+else:
+    have_pyrex = True
+
+
+class Extension(_Extension):
+    """Extension that uses '.c' files in place of '.pyx' files"""
+
+    if not have_pyrex:
+        # convert .pyx extensions to .c
+        def __init__(self,*args,**kw):
+            _Extension.__init__(self,*args,**kw)
+            sources = []
+            for s in self.sources:
+                if s.endswith('.pyx'):
+                    sources.append(s[:-3]+'c')
+                else:
+                    sources.append(s)
+            self.sources = sources
+
+class Library(Extension):
+    """Just like a regular Extension, but built as a library instead"""
+
+import sys, distutils.core, distutils.extension
+distutils.core.Extension = Extension
+distutils.extension.Extension = Extension
+if 'distutils.command.build_ext' in sys.modules:
+    sys.modules['distutils.command.build_ext'].Extension = Extension