diff -r 74eb9c51d64e Lib/_pyio.py
--- a/Lib/_pyio.py	Thu Oct 20 16:33:39 2016 -0400
+++ b/Lib/_pyio.py	Fri Oct 21 06:38:50 2016 +0900
@@ -13,8 +13,13 @@
     from _thread import allocate_lock as Lock
 except ImportError:
     from _dummy_thread import allocate_lock as Lock
-if sys.platform in {'win32', 'cygwin'}:
+if sys.platform == 'win32':
     from msvcrt import setmode as _setmode
+elif sys.platform == 'cygwin':
+    import ctypes
+    _cygwin1 = ctypes.PyDLL('cygwin1.dll')
+    def _setmode(fd, mode):
+        return _cygwin1._setmode(ctypes.c_int(fd), ctypes.c_int(mode))
 else:
     _setmode = None
 
diff -r 74eb9c51d64e Lib/ctypes/__init__.py
--- a/Lib/ctypes/__init__.py	Thu Oct 20 16:33:39 2016 -0400
+++ b/Lib/ctypes/__init__.py	Fri Oct 21 06:38:50 2016 +0900
@@ -427,7 +427,8 @@
 if _os.name == "nt":
     pythonapi = PyDLL("python dll", None, _sys.dllhandle)
 elif _sys.platform == "cygwin":
-    pythonapi = PyDLL("libpython%d.%d.dll" % _sys.version_info[:2])
+    pythonapi = PyDLL("libpython%d.%d%s.dll" %
+                      (_sys.version_info[:2] + tuple(_sys.abiflags)))
 else:
     pythonapi = PyDLL(None)
 
diff -r 74eb9c51d64e Lib/distutils/unixccompiler.py
--- a/Lib/distutils/unixccompiler.py	Thu Oct 20 16:33:39 2016 -0400
+++ b/Lib/distutils/unixccompiler.py	Fri Oct 21 06:38:50 2016 +0900
@@ -81,6 +81,7 @@
     xcode_stub_lib_format = dylib_lib_format
     if sys.platform == "cygwin":
         exe_extension = ".exe"
+        dylib_lib_extension = '.dll.a'
 
     def preprocess(self, source, output_file=None, macros=None,
                    include_dirs=None, extra_preargs=None, extra_postargs=None):