Index: Modules/posixmodule.c
===================================================================
--- Modules/posixmodule.c	(revision 67686)
+++ Modules/posixmodule.c	(working copy)
@@ -98,6 +98,7 @@
 
 /* Various compilers have only certain posix functions */
 /* XXX Gosh I wish these were all moved into pyconfig.h */
+/* XXX RWMJ agrees.  This sucks for cross-compiling. */
 #if defined(PYCC_VACPP) && defined(PYOS_OS2)
 #include <process.h>
 #else
@@ -129,6 +130,15 @@
 #define HAVE_FSYNC	1
 #define fsync _commit
 #else
+#if defined(__MINGW32__)	/* MinGW, similar to MS compiler. */
+#define HAVE_GETCWD     1
+#define HAVE_SPAWNV	1
+#define HAVE_EXECV      1
+#define HAVE_SYSTEM	1
+#define HAVE_CWAIT	1
+#define HAVE_FSYNC	1
+#define fsync _commit
+#else
 #if defined(PYOS_OS2) && defined(PYCC_GCC) || defined(__VMS)
 /* Everything needed is defined in PC/os2emx/pyconfig.h or vms/pyconfig.h */
 #else			/* all other compilers */
@@ -151,6 +161,7 @@
 #define HAVE_WAIT       1
 #define HAVE_TTYNAME	1
 #endif  /* PYOS_OS2 && PYCC_GCC && __VMS */
+#endif  /* __MINGW32__ */
 #endif  /* _MSC_VER */
 #endif  /* __BORLANDC__ */
 #endif  /* ! __WATCOMC__ || __QNX__ */
@@ -168,7 +179,7 @@
 #if defined(PYCC_VACPP)
 extern int mkdir(char *);
 #else
-#if ( defined(__WATCOMC__) || defined(_MSC_VER) ) && !defined(__QNX__)
+#if ( defined(__WATCOMC__) || defined(_MSC_VER) || defined(__MINGW32__) ) && !defined(__QNX__)
 extern int mkdir(const char *);
 #else
 extern int mkdir(const char *, mode_t);
@@ -2488,7 +2499,7 @@
 	                      Py_FileSystemDefaultEncoding, &path, &mode))
 		return NULL;
 	Py_BEGIN_ALLOW_THREADS
-#if ( defined(__WATCOMC__) || defined(PYCC_VACPP) ) && !defined(__QNX__)
+#if ( defined(__WATCOMC__) || defined(PYCC_VACPP) || defined(__MINGW32__)) && !defined(__QNX__)
 	res = mkdir(path);
 #else
 	res = mkdir(path, mode);