diff --git a/contrib/babel/langs/ob-tcl.el b/contrib/babel/langs/ob-tcl.el
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+;;; ob-tcl.el --- org-babel functions for tcl evaluation
+
+;; Copyright (C) 2009-2012  Free Software Foundation, Inc.
+
+;; Authors: Dan Davison
+;;	 Eric Schulte
+;;   Luis Anaya (tcl)
+;;
+;; Keywords: literate programming, reproducible research
+;; Homepage: http://orgmode.org
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs 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 General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Org-Babel support for evaluating tcl source code.
+
+;;; Code:
+(require 'ob)
+(require 'ob-eval)
+(eval-when-compile (require 'cl))
+
+(defvar org-babel-tangle-lang-exts)
+(add-to-list 'org-babel-tangle-lang-exts '("tcl" . "tcl"))
+
+(defvar org-babel-default-header-args:tcl nil)
+
+(defvar org-babel-tcl-command "tclsh"
+  "Name of command to use for executing tcl code.")
+
+(defun org-babel-execute:tcl (body params)
+  "Execute a block of Tcl code with Babel.
+This function is called by `org-babel-execute-src-block'."
+  (let* ((session (cdr (assoc :session params)))
+         (result-params (cdr (assoc :result-params params)))
+         (result-type (cdr (assoc :result-type params)))
+         (full-body (org-babel-expand-body:generic
+		     body params (org-babel-variable-assignments:tcl params)))
+	(session (org-babel-tcl-initiate-session session)))
+    (org-babel-reassemble-table
+     (org-babel-tcl-evaluate session full-body result-type)
+     (org-babel-pick-name
+      (cdr (assoc :colname-names params)) (cdr (assoc :colnames params)))
+     (org-babel-pick-name
+      (cdr (assoc :rowname-names params)) (cdr (assoc :rownames params))))))
+
+(defun org-babel-prep-session:tcl (session params)
+  "Prepare SESSION according to the header arguments in PARAMS."
+  (error "Sessions are not supported for Tcl."))
+
+(defun org-babel-variable-assignments:tcl (params)
+  "Return list of tcl statements assigning the block's variables."
+  (mapcar
+   (lambda (pair)
+     (format "set %s %s"
+	     (car pair)
+	     (org-babel-tcl-var-to-tcl (cdr pair))))
+   (mapcar #'cdr (org-babel-get-header params :var))))
+
+;; helper functions
+
+(defun org-babel-tcl-var-to-tcl (var)
+  "Convert an elisp value to a tcl variable.
+The elisp value, VAR, is converted to a string of tcl source code
+specifying a var of the same value."
+  (if (listp var)
+      (concat "{" (mapconcat #'org-babel-tcl-var-to-tcl var "  ") "}")
+    (format "%s" var)))
+
+(defvar org-babel-tcl-buffers '(:default . nil))
+
+(defun org-babel-tcl-initiate-session (&optional session params)
+  "Return nil because sessions are not supported by tcl."
+nil)
+
+(defvar org-babel-tcl-wrapper-method
+  "
+proc main {} {
+   %s
+}
+
+set r [eval main]
+set o [open \"%s\" \"w\"];
+puts $o $r
+flush $o
+close $o
+
+")
+
+(defvar org-babel-tcl-pp-wrapper-method
+  nil)
+
+(defun org-babel-tcl-evaluate (session body &optional result-type)
+  "Pass BODY to the Tcl process in SESSION.
+If RESULT-TYPE equals 'output then return a list of the outputs
+of the statements in BODY, if RESULT-TYPE equals 'value then
+return the value of the last statement in BODY, as elisp."
+  (when session (error "Sessions are not supported for Tcl."))
+  (case result-type
+    (output (org-babel-eval org-babel-tcl-command body))
+    (value (let ((tmp-file (org-babel-temp-file "tcl-")))
+             (org-babel-eval
+              org-babel-tcl-command
+              (format org-babel-tcl-wrapper-method body
+                      (org-babel-process-file-name tmp-file 'noquote)))
+             (org-babel-eval-read-file tmp-file)))))
+
+(provide 'ob-tcl)
+
+
+
+;;; ob-tcl.el ends here