diff --git a/Doc/whatsnew/3.3.rst b/Doc/whatsnew/3.3.rst
index d3c9a97fc1f..a2a9c19cef0 100644
--- a/Doc/whatsnew/3.3.rst
+++ b/Doc/whatsnew/3.3.rst
@@ -136,6 +136,12 @@ Changes to Python's build process and to the C API include:
 * Stub
 
 
+Unsupported operating systems
+=============================
+
+OS/2 and VMS are no more supported because of the lack of maintainer.
+
+
 Porting to Python 3.3
 =====================
 
diff --git a/Misc/NEWS b/Misc/NEWS
index 0bba1a36519..25b316c876a 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,9 @@ What's New in Python 3.3 Alpha 1?
 Core and Builtins
 -----------------
 
+- Issue #11918: OS/2 and VMS are no more supported because of the lack of
+  maintainer.
+
 - Issue #6780: fix starts/endswith error message to mention that tuples are
   accepted too.
 
diff --git a/Modules/main.c b/Modules/main.c
index 9137c85e227..747c12f9385 100644
--- a/Modules/main.c
+++ b/Modules/main.c
@@ -6,6 +6,7 @@
 #include <locale.h>
 
 #ifdef __VMS
+#error "PEP 11: VMS is now unsupported, code will be removed in Python 3.4"
 #include <unixlib.h>
 #endif
 
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 2eb3e925537..396243e0a57 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -30,6 +30,7 @@
 #include "Python.h"
 
 #if defined(__VMS)
+#    error "PEP 11: VMS is now unsupported, code will be removed in Python 3.4"
 #    include <unixio.h>
 #endif /* defined(__VMS) */
 
@@ -45,6 +46,7 @@ corresponding Unix manual entries for more information on calls.");
 
 
 #if defined(PYOS_OS2)
+#error "PEP 11: OS/2 is now unsupported, code will be removed in Python 3.4"
 #define  INCL_DOS
 #define  INCL_DOSERRORS
 #define  INCL_DOSPROCESS
diff --git a/PC/os2emx/pyconfig.h b/PC/os2emx/pyconfig.h
index 380e19c08dd..e56105af574 100644
--- a/PC/os2emx/pyconfig.h
+++ b/PC/os2emx/pyconfig.h
@@ -1,6 +1,8 @@
 #ifndef Py_CONFIG_H
 #define Py_CONFIG_H
 
+#error "PEP 11: OS/2 is now unsupported, code will be removed in Python 3.4"
+
 /* config.h.
  * At some time in the past, generated automatically by/from configure.
  * now maintained manually.