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diff --git a/module/ice-9/debugger/trc.scm b/module/ice-9/debugger/trc.scm
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+;;;; (ice-9 debugger trc) -- tracing for Guile debugger code
+
+;;; Copyright (C) 2002, 2006 Free Software Foundation, Inc.
+;;;
+;;;; This library is free software; you can redistribute it and/or
+;;;; modify it under the terms of the GNU Lesser General Public
+;;;; License as published by the Free Software Foundation; either
+;;;; version 3 of the License, or (at your option) any later version.
+;;;; 
+;;;; This library is distributed in the hope that it will be useful,
+;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;;; Lesser General Public License for more details.
+;;;; 
+;;;; You should have received a copy of the GNU Lesser General Public
+;;;; License along with this library; if not, write to the Free Software
+;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+(define-module (ice-9 debugger trc)
+  #:export (trc trc-syms trc-all trc-none trc-add trc-remove trc-port))
+
+(define *syms* #f)
+
+(define (trc-set! syms)
+  (set! *syms* syms))
+
+(define (trc-syms . syms)
+  (trc-set! syms))
+
+(define (trc-all)
+  (trc-set! #f))
+
+(define (trc-none)
+  (trc-set! '()))
+
+(define (trc-add sym)
+  (trc-set! (cons sym *syms*)))
+
+(define (trc-remove sym)
+  (trc-set! (delq1! sym *syms*)))
+
+(define (trc sym . args)
+  (if (or (not *syms*)
+	  (memq sym *syms*))
+      (let ((port (trc-port)))
+	(write sym port)
+	(display ":" port)
+	(for-each (lambda (arg)
+		    (display " " port)
+		    (write arg port))
+		  args)
+	(newline port))))
+
+(define trc-port
+  (let ((port (current-error-port)))
+    (make-procedure-with-setter
+     (lambda () port)
+     (lambda (p) (set! port p)))))
+
+;; Default to no tracing.
+(trc-none)
+
+;;; (ice-9 debugger trc) ends here.