diff -rupN Python-2.7.13/setup.py Python-2.7.13-new/setup.py
--- Python-2.7.13/setup.py	2017-01-21 01:46:07.279599302 +0100
+++ Python-2.7.13-new/setup.py	2017-01-21 01:46:07.281599281 +0100
@@ -1590,7 +1590,7 @@ class PyBuildExt(build_ext):
             macros = dict()
             libraries = ['rt']
 
-        if host_platform == 'win32':
+        if host_platform.startswith(('mingw', 'win')):
             multiprocessing_srcs = [ '_multiprocessing/multiprocessing.c',
                                      '_multiprocessing/semaphore.c',
                                      '_multiprocessing/pipe_connection.c',
@@ -1607,8 +1607,12 @@ class PyBuildExt(build_ext):
                 multiprocessing_srcs.append('_multiprocessing/semaphore.c')
 
         if sysconfig.get_config_var('WITH_THREAD'):
+            multiprocessing_libs = []
+            if host_platform.startswith(('mingw', 'win')):
+                multiprocessing_libs += ['ws2_32']
             exts.append ( Extension('_multiprocessing', multiprocessing_srcs,
                                     define_macros=macros.items(),
+                                    libraries=multiprocessing_libs,
                                     include_dirs=["Modules/_multiprocessing"]))
         else:
             missing.append('_multiprocessing')