diff -rupN Python-2.7.13/Lib/sysconfig.py Python-2.7.13-new/Lib/sysconfig.py
--- Python-2.7.13/Lib/sysconfig.py	2017-01-21 01:46:08.289588519 +0100
+++ Python-2.7.13-new/Lib/sysconfig.py	2017-01-21 01:46:08.714583981 +0100
@@ -94,6 +94,10 @@ _EXEC_PREFIX = os.path.normpath(sys.exec
 _CONFIG_VARS = None
 _USER_BASE = None
 
+# GCC[mingw*] use posix build system
+_POSIX_BUILD = os.name == 'posix' or \
+    (os.name == "nt" and 'GCC' in sys.version)
+
 def _safe_realpath(path):
     try:
         return realpath(path)
@@ -162,7 +166,7 @@ def _expand_vars(scheme, vars):
     return res
 
 def _get_default_scheme():
-    if os.name == 'posix':
+    if _POSIX_BUILD:
         # the default scheme for posix is posix_prefix
         return 'posix_prefix'
     return os.name
@@ -173,7 +177,7 @@ def _getuserbase():
         return os.path.expanduser(os.path.join(*args))
 
     # what about 'os2emx', 'riscos' ?
-    if os.name == "nt":
+    if os.name == "nt" and not _POSIX_BUILD:
         base = os.environ.get("APPDATA") or "~"
         return env_base if env_base else joinuser(base, "Python")
 
@@ -418,7 +422,7 @@ def parse_config_h(fp, vars=None):
 def get_config_h_filename():
     """Returns the path of pyconfig.h."""
     if _PYTHON_BUILD:
-        if os.name == "nt":
+        if os.name == "nt" and not _POSIX_BUILD:
             inc_dir = os.path.join(_PROJECT_BASE, "PC")
         else:
             inc_dir = _PROJECT_BASE
@@ -480,9 +484,9 @@ def get_config_vars(*args):
         _CONFIG_VARS['platbase'] = _EXEC_PREFIX
         _CONFIG_VARS['projectbase'] = _PROJECT_BASE
 
-        if os.name in ('nt', 'os2'):
+        if os.name in ('nt', 'os2') and not _POSIX_BUILD:
             _init_non_posix(_CONFIG_VARS)
-        if os.name == 'posix':
+        if _POSIX_BUILD:
             _init_posix(_CONFIG_VARS)
 
         # Setting 'userbase' is done below the call to the
@@ -497,7 +501,7 @@ def get_config_vars(*args):
         # Normally it is relative to the build directory.  However, during
         # testing, for example, we might be running a non-installed python
         # from a different directory.
-        if _PYTHON_BUILD and os.name == "posix":
+        if _PYTHON_BUILD and _POSIX_BUILD:
             base = _PROJECT_BASE
             try:
                 cwd = os.getcwd()