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 01:46:06.563606947 +0100
+++ Python-2.7.13-new/Include/pyport.h	2017-01-21 01:46:11.465554610 +0100
@@ -218,9 +218,11 @@ typedef Py_intptr_t     Py_ssize_t;
 /* Smallest negative value of type Py_ssize_t. */
 #define PY_SSIZE_T_MIN (-PY_SSIZE_T_MAX-1)
 
+/*
 #if SIZEOF_PID_T > SIZEOF_LONG
 #   error "Python doesn't support sizeof(pid_t) > sizeof(long)"
 #endif
+*/
 
 /* PY_FORMAT_SIZE_T is a platform-specific modifier for use in a printf
  * format to convert an argument with the width of a size_t or Py_ssize_t.
@@ -252,6 +254,8 @@ typedef Py_intptr_t     Py_ssize_t;
 #       define PY_FORMAT_SIZE_T "l"
 #   elif defined(MS_WINDOWS)
 #       define PY_FORMAT_SIZE_T "I"
+#   elif defined(__MINGW32__) && defined(__USE_MINGW_ANSI_STDIO)
+#       define PY_FORMAT_SIZE_T "z"
 #   else
 #       error "This platform's pyconfig.h needs to define PY_FORMAT_SIZE_T"
 #   endif