diff --git a/misc/cmpdef.cmd b/misc/cmpdef.cmd
new file mode 100644
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+++ b/misc/cmpdef.cmd
@@ -0,0 +1,134 @@
+/****************************************************************************
+ * 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: cmpdef.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/
+ *
+ * cmpdef.cmd - compares two .def files, checking whether they have
+ *		the same entries with the same export codes.
+ *
+ * returns 0 if there are no conflicts between the files -- that is,
+ * the newer one can replace the older one.
+ *
+ * returns 1 when either of the files is not properly formatted and
+ * when there are conflicts: two symbols having the same export code.
+ *
+ * the standard output shows a list with newly added symbols, plus
+ * replaced symbols and conflicts.
+ */
+parse arg def_file1 def_file2
+
+def_file1 = translate(def_file1,'\','/')
+def_file2 = translate(def_file2,'\','/')
+
+call CleanQueue
+
+/*
+ * `cmp' is zero when the last file is valid and upward compatible
+ * `numbers' is the stem where symbols are stored
+ */
+cmp      = 0
+names.   = ''
+numbers. = 0
+
+/*
+ * 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_file1 '| sed' tidy_up '| sort | rxqueue'
+
+do while queued() > 0
+   /*
+    * We retrieve the symbol name (NAME) and its number (NUMBER)
+    */
+   parse pull '"' name '"' '@'number rest
+   if number = '' || name = '' then
+      do
+      say 'Corrupted file' def_file1
+      say 'Symbol' name 'has no number'
+      exit 1
+      end
+   else
+      do
+      numbers.name = number
+      names.number = name
+      end
+end
+
+/*
+ * Now we find all public symbols from the new DLL, and compare.
+ */
+'type' def_file2 '| sed' tidy_up '| sort | rxqueue'
+
+do while queued() > 0
+   parse pull '"' name '"' '@'number rest
+   if name = '' | number = '' then
+      do
+      say 'Corrupted file' def_file2
+      say 'Symbol' name 'has no number'
+      exit 1
+      end
+   if numbers.name = 0 then
+      do
+      cmp = 1
+      if names.number = '' then
+         say 'New symbol' name 'with code @'number
+      else
+         say 'Conflict old =' names.number ', new =' name 'at @'number
+      end
+   else if numbers.name \= number then
+      do
+      cmp = 1
+      say name 'Symbol' name 'changed from @'numbers.name 'to @'number
+      end
+end /* do */
+
+exit cmp
+
+/*
+ * Cleans the REXX queue by pulling and forgetting every line.
+ * This is needed, at least, when `cmpdef.cmd' starts, because an aborted
+ * REXX program might have left some rubbish in.
+ */
+CleanQueue: procedure
+   do while queued() > 0
+      parse pull foo
+   end
+return
+