diff -r 20dc8d6430eb Include/pyport.h
--- a/Include/pyport.h	Mon Feb 10 19:17:46 2014 +0100
+++ b/Include/pyport.h	Tue Feb 11 12:25:09 2014 -0500
@@ -856,6 +856,25 @@
 #define Py_ULL(x) Py_LL(x##U)
 #endif
 
+/* There are some variations of wcstok() functionality on Windows.  Open
+ * Watcom provides a POSIX-like wcstok() function, accepting three
+ * parameters.  Microsoft provides an equivalent via the wcstok_s()
+ * function, which, incidently, is not compatible with Open Watcom's
+ * wcstok_s() function.  If it's neither of the two, default to a simple
+ * two-argument version (which is all MinGW provides, incidentally).  
+ */
+#ifdef MS_WINDOWS
+#ifdef _MSC_VER
+#define Py_WCSTOK(x,y,z)  wcstok_s(x,y,z)
+#else
+#ifdef __WATCOMC__
+#define Py_WCSTOK(x,y,z)  wcstok(x,y,z)
+#else
+#define Py_WCSTOK(x,y,z)  wcstok(x,y)
+#endif /* __WATCOMC__ */
+#endif /* _MSC_VER */
+#endif /* MS_WINDOWS */
+
 #ifdef VA_LIST_IS_ARRAY
 #define Py_VA_COPY(x, y) Py_MEMCPY((x), (y), sizeof(va_list))
 #else
diff -r 20dc8d6430eb Modules/main.c
--- a/Modules/main.c	Mon Feb 10 19:17:46 2014 +0100
+++ b/Modules/main.c	Tue Feb 11 12:25:09 2014 -0500
@@ -511,16 +511,16 @@
 #ifdef MS_WINDOWS
     if (!Py_IgnoreEnvironmentFlag && (wp = _wgetenv(L"PYTHONWARNINGS")) &&
         *wp != L'\0') {
-        wchar_t *buf, *warning;
+        wchar_t *buf, *state, *warning;
 
         buf = (wchar_t *)PyMem_RawMalloc((wcslen(wp) + 1) * sizeof(wchar_t));
         if (buf == NULL)
             Py_FatalError(
                "not enough memory to copy PYTHONWARNINGS");
         wcscpy(buf, wp);
-        for (warning = wcstok(buf, L",");
+        for (warning = Py_WCSTOK(buf, L",", &state);
              warning != NULL;
-             warning = wcstok(NULL, L",")) {
+             warning = Py_WCSTOK(NULL, L",", &state)) {
             PySys_AddWarnOption(warning);
         }
         PyMem_RawFree(buf);
diff -r 20dc8d6430eb PC/getpathp.c
--- a/PC/getpathp.c	Mon Feb 10 19:17:46 2014 +0100
+++ b/PC/getpathp.c	Tue Feb 11 12:25:09 2014 -0500
@@ -96,7 +96,6 @@
 static wchar_t dllpath[MAXPATHLEN+1];
 static wchar_t *module_search_path = NULL;
 
-
 static int
 is_sep(wchar_t ch)      /* determine if "ch" is a separator character */
 {
@@ -451,11 +450,12 @@
                                      tmpbuffer, MAXPATHLEN * 2);
             Py_DECREF(decoded);
             if (k >= 0) {
-                wchar_t * tok = wcstok(tmpbuffer, L" \t\r\n");
+                wchar_t *state;
+                wchar_t * tok = Py_WCSTOK(tmpbuffer, L" \t\r\n", &state);
                 if ((tok != NULL) && !wcscmp(tok, key)) {
-                    tok = wcstok(NULL, L" \t");
+                    tok = Py_WCSTOK(NULL, L" \t", &state);
                     if ((tok != NULL) && !wcscmp(tok, L"=")) {
-                        tok = wcstok(NULL, L"\r\n");
+                        tok = Py_WCSTOK(NULL, L"\r\n", &state);
                         if (tok != NULL) {
                             wcsncpy(value, tok, MAXPATHLEN);
                             result = 1;