diff -rupN Python-2.7.13/Include/pyport.h Python-2.7.13-new/Include/pyport.h
--- Python-2.7.13/Include/pyport.h	2017-01-21 01:46:04.507628898 +0100
+++ Python-2.7.13-new/Include/pyport.h	2017-01-21 01:46:06.422608452 +0100
@@ -770,37 +770,39 @@ extern int fdatasync(int);
 */
 
 /*
-  All windows ports, except cygwin, are handled in PC/pyconfig.h.
+  Only MSVC windows ports is handled in PC/pyconfig.h.
 
-  BeOS and cygwin are the only other autoconf platform requiring special
+  Cygwin and Mingw are autoconf platforms requiring special
   linkage handling and both of these use __declspec().
 */
-#if defined(__CYGWIN__) || defined(__BEOS__)
+#if defined(__CYGWIN__) || defined(__BEOS__) || defined(__MINGW32__)
 #       define HAVE_DECLSPEC_DLL
 #endif
 
 /* only get special linkage if built as shared or platform is Cygwin */
 #if defined(Py_ENABLE_SHARED) || defined(__CYGWIN__)
 #       if defined(HAVE_DECLSPEC_DLL)
-#               ifdef Py_BUILD_CORE
+#               if defined(Py_BUILD_CORE) || defined(Py_BUILD_CORE_MODULE)
 #                       define PyAPI_FUNC(RTYPE) __declspec(dllexport) RTYPE
 #                       define PyAPI_DATA(RTYPE) extern __declspec(dllexport) RTYPE
         /* module init functions inside the core need no external linkage */
-        /* except for Cygwin to handle embedding (FIXME: BeOS too?) */
-#                       if defined(__CYGWIN__)
+        /* except for Cygwin/Mingw to handle embedding (FIXME: BeOS too?) */
+#                       if defined(__CYGWIN__) || defined(__MINGW32__)
 #                               define PyMODINIT_FUNC __declspec(dllexport) void
-#                       else /* __CYGWIN__ */
+#                       else
 #                               define PyMODINIT_FUNC void
-#                       endif /* __CYGWIN__ */
-#               else /* Py_BUILD_CORE */
+#                       endif
+#               else /* Py_BUILD_CORE... */
         /* Building an extension module, or an embedded situation */
         /* public Python functions and data are imported */
-        /* Under Cygwin, auto-import functions to prevent compilation */
+        /* Under Cygwin/Mingw, auto-import functions to prevent compilation */
         /* failures similar to those described at the bottom of 4.1: */
         /* http://docs.python.org/extending/windows.html#a-cookbook-approach */
-#                       if !defined(__CYGWIN__)
+#                       if defined(__CYGWIN__) || defined(__MINGW32__)
+#                               define PyAPI_FUNC(RTYPE) RTYPE
+#                       else
 #                               define PyAPI_FUNC(RTYPE) __declspec(dllimport) RTYPE
-#                       endif /* !__CYGWIN__ */
+#                       endif
 #                       define PyAPI_DATA(RTYPE) extern __declspec(dllimport) RTYPE
         /* module init functions outside the core must be exported */
 #                       if defined(__cplusplus)
@@ -808,7 +810,7 @@ extern int fdatasync(int);
 #                       else /* __cplusplus */
 #                               define PyMODINIT_FUNC __declspec(dllexport) void
 #                       endif /* __cplusplus */
-#               endif /* Py_BUILD_CORE */
+#               endif /* Py_BUILD_CORE... */
 #       endif /* HAVE_DECLSPEC */
 #endif /* Py_ENABLE_SHARED */
 
diff -rupN Python-2.7.13/setup.py Python-2.7.13-new/setup.py
--- Python-2.7.13/setup.py	2017-01-21 01:46:04.217631994 +0100
+++ Python-2.7.13-new/setup.py	2017-01-21 01:46:06.423608441 +0100
@@ -178,6 +178,9 @@ class PyBuildExt(build_ext):
 
     def build_extensions(self):
 
+        if host_platform.startswith(('mingw', 'win', 'cygwin')):
+            self.compiler.define_macro("Py_BUILD_CORE_MODULE")
+
         # Detect which modules should be compiled
         missing = self.detect_modules()