diff --git a/ACE/ace/OS_NS_dirent.h b/ACE/ace/OS_NS_dirent.h
index 5d0a3f5addd1b..325bc450fa313 100644
--- a/ACE/ace/OS_NS_dirent.h
+++ b/ACE/ace/OS_NS_dirent.h
@@ -52,7 +52,7 @@ extern "C" {
  * using the pre-processor.
  */
 #if !defined (ACE_LACKS_REWINDDIR)
-#  if !defined (ACE_HAS_WREWINDDIR) || !defined (ACE_USES_WCHAR)
+#  if !defined (ACE_HAS_WREWINDDIR_EQUIVALENT) || !defined (ACE_USES_WCHAR)
 inline void ace_rewinddir_helper (ACE_DIR *dir)
 {
 #    if defined (rewinddir)
@@ -63,7 +63,7 @@ inline void ace_rewinddir_helper (ACE_DIR *dir)
 #    endif /* defined (rewinddir) */
 }
 #  endif /* !defined (ACE_HAS_WREWINDDIR) && !defined (ACE_USES_WCHAR) */
-#endif /* ACE_LACKS_REWINDDIR */
+#endif /* ACE_HAS_WREWINDDIR_EQUIVALENT */
 
 ACE_BEGIN_VERSIONED_NAMESPACE_DECL
 
diff --git a/ACE/ace/OS_NS_dirent.inl b/ACE/ace/OS_NS_dirent.inl
index 88a5154e0a5db..2894273d3f9bd 100644
--- a/ACE/ace/OS_NS_dirent.inl
+++ b/ACE/ace/OS_NS_dirent.inl
@@ -18,8 +18,8 @@ closedir (ACE_DIR *d)
   ACE_OS::closedir_emulation (d);
   delete [] d->directory_name_;
   delete d;
-# elif defined (ACE_HAS_WCLOSEDIR) && defined (ACE_USES_WCHAR)
-  ::wclosedir (d);
+# elif defined (ACE_HAS_WCLOSEDIR_EQUIVALENT) && defined (ACE_USES_WCHAR)
+  ACE_HAS_WCLOSEDIR_EQUIVALENT (d);
 # else /* ACE_WIN32 && ACE_LACKS_CLOSEDIR */
   ::closedir (d);
 # endif /* ACE_WIN32 && ACE_LACKS_CLOSEDIR */
@@ -35,8 +35,8 @@ opendir (const ACE_TCHAR *filename)
 #if defined (ACE_HAS_DIRENT)
 #    if (defined (ACE_WIN32) || defined(ACE_MQX)) && defined (ACE_LACKS_OPENDIR)
   return ::ACE_OS::opendir_emulation (filename);
-#  elif defined (ACE_HAS_WOPENDIR) && defined (ACE_USES_WCHAR)
-  return ::wopendir (filename);
+#  elif defined (ACE_HAS_WOPENDIR_EQUIVALENT) && defined (ACE_USES_WCHAR)
+  return ACE_HAS_WOPENDIR_EQUIVALENT (filename);
 #    else /* ! ACE_WIN32 && ACE_LACKS_OPENDIR */
   return ::opendir (ACE_TEXT_ALWAYS_CHAR (filename));
 #    endif /* ACE_WIN32 && ACE_LACKS_OPENDIR */
@@ -52,8 +52,8 @@ readdir (ACE_DIR *d)
 #if defined (ACE_HAS_DIRENT)
 #  if (defined (ACE_WIN32) || defined (ACE_MQX)) && defined (ACE_LACKS_READDIR)
      return ACE_OS::readdir_emulation (d);
-#  elif defined (ACE_HAS_WREADDIR) && defined (ACE_USES_WCHAR)
-     return ::wreaddir (d);
+#  elif defined (ACE_HAS_WREADDIR_EQUIVALENT) && defined (ACE_USES_WCHAR)
+     return ACE_HAS_WREADDIR_EQUIVALENT (d);
 #  else /* ACE_WIN32 && ACE_LACKS_READDIR */
      return ::readdir (d);
 #  endif /* ACE_WIN32 && ACE_LACKS_READDIR */
@@ -67,8 +67,8 @@ ACE_INLINE void
 rewinddir (ACE_DIR *d)
 {
 #if defined (ACE_HAS_DIRENT)
-#  if defined (ACE_HAS_WREWINDDIR) && defined (ACE_USES_WCHAR)
-  ::wrewinddir (d);
+#  if defined (ACE_HAS_WREWINDDIR_EQUIVALENT) && defined (ACE_USES_WCHAR)
+  ACE_HAS_WREWINDDIR_EQUIVALENT (d);
 #  elif !defined (ACE_LACKS_REWINDDIR)
   ace_rewinddir_helper (d);
 #  else
diff --git a/ACE/ace/OS_NS_time.inl b/ACE/ace/OS_NS_time.inl
index a41b805d4d0da..cdce0c2ae7e01 100644
--- a/ACE/ace/OS_NS_time.inl
+++ b/ACE/ace/OS_NS_time.inl
@@ -106,8 +106,8 @@ ACE_OS::ctime (const time_t *t)
   // we've done this before, free the previous one. Yes, this leaves a
   // small memory leak (26 characters) but there's no way around this
   // that I know of. (Steve Huston, 12-Feb-2003).
-  static wchar_t *wide_time = 0;
-  if (wide_time != 0)
+  static wchar_t *wide_time = nullptr;
+  if (wide_time != nullptr)
     delete [] wide_time;
   wide_time = ACE_Ascii_To_Wide::convert (narrow_time);
   return wide_time;
@@ -124,7 +124,7 @@ ACE_OS::ctime_r (const time_t *t, ACE_TCHAR *buf, int buflen)
 
 #if defined (ACE_HAS_REENTRANT_FUNCTIONS)
 
-  char *bufp = 0;
+  char *bufp = nullptr;
 #   if defined (ACE_USES_WCHAR)
   char narrow_buf[ctime_buf_size];
   bufp = narrow_buf;
@@ -149,8 +149,8 @@ ACE_OS::ctime_r (const time_t *t, ACE_TCHAR *buf, int buflen)
 
 #   endif /* ACE_HAS_2_PARAM_ASCTIME_R_AND_CTIME_R */
 
-  if (bufp == 0)
-    return 0;
+  if (bufp == nullptr)
+    return nullptr;
 
 #   if defined (ACE_USES_WCHAR)
   ACE_Ascii_To_Wide wide_buf (bufp);
@@ -164,7 +164,7 @@ ACE_OS::ctime_r (const time_t *t, ACE_TCHAR *buf, int buflen)
   if (buflen < ctime_buf_size)
     {
       errno = ERANGE;
-      return 0;
+      return nullptr;
     }
   ACE_TCHAR *result = buf;
 #  if defined (ACE_USES_WCHAR)
@@ -178,16 +178,16 @@ ACE_OS::ctime_r (const time_t *t, ACE_TCHAR *buf, int buflen)
   if (buflen < ctime_buf_size)
     {
       errno = ERANGE;
-      return 0;
+      return nullptr;
     }
 
-  ACE_TCHAR *result = 0;
+  ACE_TCHAR *result = nullptr;
 #     if defined (ACE_USES_WCHAR)
   ACE_OSCALL (::_wctime (t), wchar_t *, result);
 #     else /* ACE_USES_WCHAR */
   ACE_OSCALL (::ctime (t), char *, result);
 #     endif /* ACE_USES_WCHAR */
-  if (result != 0)
+  if (result != nullptr)
     ACE_OS::strsncpy (buf, result, buflen);
   return buf;
 #endif /* ACE_HAS_REENTRANT_FUNCTIONS */
diff --git a/ACE/ace/config-win32-borland.h b/ACE/ace/config-win32-borland.h
index 3502742130d23..ef884c79f4d6d 100644
--- a/ACE/ace/config-win32-borland.h
+++ b/ACE/ace/config-win32-borland.h
@@ -96,10 +96,17 @@
 
 #undef ACE_LACKS_REWINDDIR
 
-#define ACE_HAS_WOPENDIR
-#define ACE_HAS_WCLOSEDIR
-#define ACE_HAS_WREADDIR
-#define ACE_HAS_WREWINDDIR
+#if !defined (__MINGW64__)
+# define ACE_HAS_WOPENDIR_EQUIVALENT ::wopendir
+# define ACE_HAS_WCLOSEDIR_EQUIVALENT ::wclosedir
+# define ACE_HAS_WREADDIR_EQUIVALENT ::wreaddir
+# define ACE_HAS_WREWINDDIR_EQUIVALENT ::wrewinddir
+#else
+# define ACE_HAS_WOPENDIR_EQUIVALENT ::_wopendir
+# define ACE_HAS_WCLOSEDIR_EQUIVALENT ::_wclosedir
+# define ACE_HAS_WREADDIR_EQUIVALENT ::_wreaddir
+# define ACE_HAS_WREWINDDIR_EQUIVALENT ::_wrewinddir
+#endif
 
 #define ACE_LACKS_STRRECVFD
 
diff --git a/ACE/ace/os_include/os_dirent.h b/ACE/ace/os_include/os_dirent.h
index 650fb402d968a..9ff7d83acee1b 100644
--- a/ACE/ace/os_include/os_dirent.h
+++ b/ACE/ace/os_include/os_dirent.h
@@ -80,8 +80,13 @@ struct ACE_DIR {
 };
 #elif defined (ACE_WIN32) && (__BORLANDC__) && defined (ACE_USES_WCHAR)
 #define ACE_HAS_TCHAR_DIRENT
-#define ACE_DIRENT wdirent
+#if defined(__MINGW64__)
+# define ACE_DIRENT _wdirent
+typedef _WDIR ACE_DIR;
+#else
+# define ACE_DIRENT wdirent
 typedef wDIR ACE_DIR;
+#endif
 #else
 #define ACE_DIRENT dirent
 typedef DIR ACE_DIR;
diff --git a/ACE/bin/MakeProjectCreator/config/acedefaults.mpb b/ACE/bin/MakeProjectCreator/config/acedefaults.mpb
index 14f3df0421b7e..bcc17609a93c5 100644
--- a/ACE/bin/MakeProjectCreator/config/acedefaults.mpb
+++ b/ACE/bin/MakeProjectCreator/config/acedefaults.mpb
@@ -16,7 +16,6 @@ project: ipv6, vc_warnings, build_files, test_files, svc_conf_files, ace_unicode
   // Support the alternative Borland Make project type
   specific(bmake) {
     unicode_flags += -DACE_USES_WCHAR
-    macros += MPC_LIB_MODIFIER=\\"$(LIBMODIFIER)$(ULIBMODIFIER)\\"
     debug_macros += ACE_NO_INLINE=1
     platform_libs += iphlpapi
     lit_libs -= iphlpapi