diff --git a/misc/chkdef.cmd b/misc/chkdef.cmd
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--- /dev/null
+++ b/misc/chkdef.cmd
@@ -0,0 +1,114 @@
+/****************************************************************************
+ * Copyright (c) 1998,2006 Free Software Foundation, Inc.                   *
+ *                                                                          *
+ * Permission is hereby granted, free of charge, to any person obtaining a  *
+ * copy of this software and associated documentation files (the            *
+ * "Software"), to deal in the Software without restriction, including      *
+ * without limitation the rights to use, copy, modify, merge, publish,      *
+ * distribute, distribute with modifications, sublicense, and/or sell       *
+ * copies of the Software, and to permit persons to whom the Software is    *
+ * furnished to do so, subject to the following conditions:                 *
+ *                                                                          *
+ * The above copyright notice and this permission notice shall be included  *
+ * in all copies or substantial portions of the Software.                   *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
+ *                                                                          *
+ * Except as contained in this notice, the name(s) of the above copyright   *
+ * holders shall not be used in advertising or otherwise to promote the     *
+ * sale, use or other dealings in this Software without prior written       *
+ * authorization.                                                           *
+ ****************************************************************************/
+
+/*
+ * $Id: chkdef.cmd,v 1.3 2006/04/22 23:14:50 tom Exp $
+ *
+ * Author:  Juan Jose Garcia Ripoll <worm@arrakis.es>.
+ * Webpage: http://www.arrakis.es/~worm/
+ *
+ * chkdef.cmd - checks that a .def file has no conflicts and is properly
+ *		formatted.
+ *
+ * returns nonzero if two symbols have the same code or a line has a wrong
+ * format.
+ *
+ * returns 0 otherwise
+ *
+ * the standard output shows conflicts.
+ */
+parse arg def_file
+
+def_file = translate(def_file,'\','/')
+
+call CleanQueue
+
+/*
+ * `cmp' is zero when the file is valid
+ * `codes' associates a name to a code
+ * `names' associates a code to a name
+ */
+cmp    = 0
+codes. = 0
+names. = ''
+
+/*
+ * This sed expression cleans empty lines, comments and special .DEF
+ * commands, such as LIBRARY..., EXPORTS..., etc
+ */
+tidy_up  = '"s/[ 	][ 	]*/ /g;s/;.*//g;/^[ ]*$/d;/^[a-zA-Z]/d;"'
+
+/*
+ * First we find all public symbols from the original DLL. All this
+ * information is pushed into a REXX private list with the RXQUEUE
+ * utility program.
+ */
+'@echo off'
+'type' def_file '| sed' tidy_up '| sort | rxqueue'
+
+do while queued() > 0
+   /*
+    * We retrieve the symbol name (NEW_NAME) and its code (NEW_CODE)
+    */
+   parse pull '"' new_name '"' '@'new_code rest
+   select
+      when (new_code = '') | (new_name = '') then
+         /* The input was not properly formatted */
+         do
+         say 'Error: symbol "'new_name'" has no export code or is empty'
+         cmp = 1
+         end
+      when codes.new_name \= 0 then
+         /* This symbol was already defined */
+         if codes.new_name \= new_code then
+            do
+	    cmp = 2
+ 	    say 'Symbol "'new_name'" multiply defined'
+	    end
+      when names.new_code \= '' then
+         /* This code was already assigned to a symbol */
+         if names.new_code \= new_name then
+            do
+            cmp = 3
+	    say 'Conflict with "'names.new_code'" & "'new_name'" being @'new_code
+            end
+      otherwise
+         do
+         codes.new_name = new_code
+         names.new_code = new_name
+         end
+   end  /* select */
+end
+
+exit cmp
+
+CleanQueue: procedure
+	do while queued() > 0
+	   parse pull foo
+	end
+return