* Added support for X11 modules.
* Makefile: change location of FORMS library.
* posixmodule.c: turn #if 0 into #ifdef MSDOS (stuff in unistd.h or not)
* Almost all .h files: added CPP magic to avoid duplicate inclusions and
  to support inclusion from C++.
diff --git a/Include/listobject.h b/Include/listobject.h
index f18877f..7af8058 100644
--- a/Include/listobject.h
+++ b/Include/listobject.h
@@ -1,3 +1,9 @@
+#ifndef Py_LISTOBJECT_H
+#define Py_LISTOBJECT_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /***********************************************************
 Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
 Amsterdam, The Netherlands.
@@ -59,3 +65,8 @@
 
 /* Macro, trading safety for speed */
 #define GETLISTITEM(op, i) ((op)->ob_item[i])
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* !Py_LISTOBJECT_H */