diff --git a/Lib/ctypes/util.py b/Lib/ctypes/util.py
index ab10ec5..6c43d82 100644
--- a/Lib/ctypes/util.py
+++ b/Lib/ctypes/util.py
@@ -19,6 +19,8 @@ if os.name == "nt":
         i = i + len(prefix)
         s, rest = sys.version[i:].split(" ", 1)
         majorVersion = int(s[:-2]) - 6
+        if majorVersion >= 13:
+           majorVersion += 1
         minorVersion = int(s[2:3]) / 10.0
         # I don't think paths are affected by minor version in version 6
         if majorVersion == 6:
@@ -36,8 +38,10 @@ if os.name == "nt":
             return None
         if version <= 6:
             clibname = 'msvcrt'
-        else:
+        elif version <= 13:
             clibname = 'msvcr%d' % (version * 10)
+        else:
+            clibname = 'appcrt%d' % (version * 10)
 
         # If python was built with in debug mode
         import imp
diff --git a/Lib/distutils/command/build_ext.py b/Lib/distutils/command/build_ext.py
index 65a60b5..b2ee260 100644
--- a/Lib/distutils/command/build_ext.py
+++ b/Lib/distutils/command/build_ext.py
@@ -196,7 +196,7 @@ class build_ext (Command):
             if MSVC_VERSION >= 9:
                 # Use the .lib files for the correct architecture
                 if self.plat_name == 'win32':
-                    suffix = ''
+                    suffix = 'win32'
                 else:
                     # win-amd64 or win-ia64
                     suffix = self.plat_name[4:]
diff --git a/Lib/distutils/msvc9compiler.py b/Lib/distutils/msvc9compiler.py
index 9fe6417..57d42b7 100644
--- a/Lib/distutils/msvc9compiler.py
+++ b/Lib/distutils/msvc9compiler.py
@@ -182,6 +182,9 @@ def get_build_version():
     i = i + len(prefix)
     s, rest = sys.version[i:].split(" ", 1)
     majorVersion = int(s[:-2]) - 6
+    if majorVersion >= 13:
+        # v13 was skipped and should be v14
+        majorVersion += 1
     minorVersion = int(s[2:3]) / 10.0
     # I don't think paths are affected by minor version in version 6
     if majorVersion == 6:
diff --git a/Lib/distutils/msvccompiler.py b/Lib/distutils/msvccompiler.py
index 0e69fd3..77025c6 100644
--- a/Lib/distutils/msvccompiler.py
+++ b/Lib/distutils/msvccompiler.py
@@ -164,6 +164,9 @@ def get_build_version():
     i = i + len(prefix)
     s, rest = sys.version[i:].split(" ", 1)
     majorVersion = int(s[:-2]) - 6
+    if majorVersion >= 13:
+        # v13 was skipped and should be v14
+        majorVersion += 1
     minorVersion = int(s[2:3]) / 10.0
     # I don't think paths are affected by minor version in version 6
     if majorVersion == 6:
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 7a1a694..7d07150 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -558,15 +558,33 @@ _PyInt_FromDev(PY_LONG_LONG v)
 /* The actual size of the structure is determined at runtime.
  * Only the first items must be present.
  */
+
+#if _MSC_VER >= 1900
+
+typedef struct {
+    CRITICAL_SECTION lock;
+    intptr_t osfhnd;
+    __int64 startpos;
+    char osfile;
+} my_ioinfo;
+
+#define IOINFO_L2E 6
+#define IOINFO_ARRAYS 128
+
+#else
+
 typedef struct {
     intptr_t osfhnd;
     char osfile;
 } my_ioinfo;
 
-extern __declspec(dllimport) char * __pioinfo[];
 #define IOINFO_L2E 5
-#define IOINFO_ARRAY_ELTS   (1 << IOINFO_L2E)
 #define IOINFO_ARRAYS 64
+
+#endif
+
+extern __declspec(dllimport) char * __pioinfo[];
+#define IOINFO_ARRAY_ELTS   (1 << IOINFO_L2E)
 #define _NHANDLE_           (IOINFO_ARRAYS * IOINFO_ARRAY_ELTS)
 #define FOPEN 0x01
 #define _NO_CONSOLE_FILENO (intptr_t)-2
diff --git a/Modules/timemodule.c b/Modules/timemodule.c
index 61b8d61..7678283 100644
--- a/Modules/timemodule.c
+++ b/Modules/timemodule.c
@@ -808,7 +808,7 @@ inittimezone(PyObject *m) {
 #ifdef PYOS_OS2
     PyModule_AddIntConstant(m, "timezone", _timezone);
 #else /* !PYOS_OS2 */
-    PyModule_AddIntConstant(m, "timezone", timezone);
+    PyModule_AddIntConstant(m, "timezone", _timezone);
 #endif /* PYOS_OS2 */
 #ifdef HAVE_ALTZONE
     PyModule_AddIntConstant(m, "altzone", altzone);
@@ -816,7 +816,7 @@ inittimezone(PyObject *m) {
 #ifdef PYOS_OS2
     PyModule_AddIntConstant(m, "altzone", _timezone-3600);
 #else /* !PYOS_OS2 */
-    PyModule_AddIntConstant(m, "altzone", timezone-3600);
+    PyModule_AddIntConstant(m, "altzone", _timezone-3600);
 #endif /* PYOS_OS2 */
 #endif
     PyModule_AddIntConstant(m, "daylight", daylight);
diff --git a/PC/bdist_wininst/install.c b/PC/bdist_wininst/install.c
index e3b52a8..a7d1c2c 100644
--- a/PC/bdist_wininst/install.c
+++ b/PC/bdist_wininst/install.c
@@ -1185,7 +1185,7 @@ static void CenterWindow(HWND hwnd)
 
 #include <prsht.h>
 
-BOOL CALLBACK
+INT_PTR CALLBACK
 IntroDlgProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 {
     LPNMHDR lpnm;
@@ -1534,7 +1534,7 @@ SCHEME *GetScheme(int major, int minor)
     return old_scheme;
 }
 
-BOOL CALLBACK
+INT_PTR CALLBACK
 SelectPythonDlgProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 {
     LPNMHDR lpnm;
@@ -1836,7 +1836,7 @@ static void CloseLogfile(void)
         fclose(logfile);
 }
 
-BOOL CALLBACK
+INT_PTR CALLBACK
 InstallFilesDlgProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 {
     LPNMHDR lpnm;
@@ -1991,7 +1991,7 @@ InstallFilesDlgProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 }
 
 
-BOOL CALLBACK
+INT_PTR CALLBACK
 FinishedDlgProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 {
     LPNMHDR lpnm;
@@ -2167,23 +2167,6 @@ BOOL NeedAutoUAC()
     return TRUE;
 }
 
-// Returns TRUE if the platform supports UAC.
-BOOL PlatformSupportsUAC()
-{
-    // Note that win2k does seem to support ShellExecute with 'runas',
-    // but does *not* support IsUserAnAdmin - so we just pretend things
-    // only work on XP and later.
-    BOOL bIsWindowsXPorLater;
-    OSVERSIONINFO winverinfo;
-    winverinfo.dwOSVersionInfoSize = sizeof(winverinfo);
-    if (!GetVersionEx(&winverinfo))
-        return FALSE; // something bad has gone wrong
-    bIsWindowsXPorLater =
-       ( (winverinfo.dwMajorVersion > 5) ||
-       ( (winverinfo.dwMajorVersion == 5) && (winverinfo.dwMinorVersion >= 1) ));
-    return bIsWindowsXPorLater;
-}
-
 // Spawn ourself as an elevated application.  On failure, a message is
 // displayed to the user - but this app will always terminate, even
 // on error.
@@ -2239,7 +2222,7 @@ int DoInstall(void)
 
     // See if we need to do the Vista UAC magic.
     if (strcmp(user_access_control, "force")==0) {
-        if (PlatformSupportsUAC() && !MyIsUserAnAdmin()) {
+        if (!MyIsUserAnAdmin()) {
             SpawnUAC();
             return 0;
         }
@@ -2247,7 +2230,7 @@ int DoInstall(void)
     } else if (strcmp(user_access_control, "auto")==0) {
         // Check if it looks like we need UAC control, based
         // on how Python itself was installed.
-        if (PlatformSupportsUAC() && !MyIsUserAnAdmin() && NeedAutoUAC()) {
+        if (!MyIsUserAnAdmin() && NeedAutoUAC()) {
             SpawnUAC();
             return 0;
         }
diff --git a/PC/pyconfig.h b/PC/pyconfig.h
index 0cbd236..d896a38 100644
--- a/PC/pyconfig.h
+++ b/PC/pyconfig.h
@@ -226,6 +226,13 @@ typedef int pid_t;
 #define Py_IS_FINITE(X) _finite(X)
 #define copysign _copysign
 
+/* VS 2015 defines these names with a leading underscore */
+#if _MSC_VER >= 1900
+// #define timezone _timezone
+#define daylight _daylight
+#define tzname _tzname
+#endif
+
 /* Side by Side assemblies supported in VS 2005 and VS 2008 but not 2010*/
 #if _MSC_VER >= 1400 && _MSC_VER < 1600
 #define HAVE_SXS 1