diff -Naur Python-3.8.0-orig/Include/pyport.h Python-3.8.0/Include/pyport.h
--- Python-3.8.0-orig/Include/pyport.h	2019-10-14 16:34:47.000000000 +0300
+++ Python-3.8.0/Include/pyport.h	2019-10-22 10:00:36.224300300 +0300
@@ -26,6 +26,21 @@
 #endif
 
 
+#ifdef __MINGW32__
+/* Translate GCC[mingw*] platform specific defines to those
+ * used in python code.
+ */
+#if !defined(MS_WIN64) && defined(_WIN64)
+#  define MS_WIN64
+#endif
+#if !defined(MS_WIN32) && defined(_WIN32)
+#  define MS_WIN32
+#endif
+#if !defined(MS_WINDOWS) && defined(MS_WIN32)
+#  define MS_WINDOWS
+#endif
+#endif /* __MINGW32__*/
+
 /**************************************************************************
 Symbols and macros to supply platform-independent interfaces to basic
 C language & library operations whose spellings vary across platforms.
