gnu: Add Tor.

* gnu/packages/tor.scm: New file.
* Makefile.am (MODULES): Add it.

Makefile.am

@@ -122,6 +122,7 @@ MODULES =					\
   gnu/packages/tcl.scm				\
   gnu/packages/texinfo.scm			\
   gnu/packages/time.scm				\
+  gnu/packages/tor.scm				\
   gnu/packages/wget.scm				\
   gnu/packages/which.scm			\
   gnu/packages/xml.scm				\

gnu/packages/tor.scm

@@ -0,0 +1,54 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix 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 Guix 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 Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages tor)
+  #:use-module ((guix licenses) #:select (bsd-3))
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu)
+  #:use-module (gnu packages libevent)
+  #:use-module (gnu packages compression)
+  #:use-module (gnu packages openssl))
+
+(define-public tor
+  (package
+    (name "tor")
+    (version "0.2.3.25")
+    (source (origin
+             (method url-fetch)
+             (uri (string-append "https://www.torproject.org/dist/tor-"
+                                 version ".tar.gz"))
+             (sha256
+              (base32
+               "183n667zgmp37brxl4qna1ciw6dz8d0ihd3fgv9i2gpk6q8nybdv"))))
+    (build-system gnu-build-system)
+    (inputs
+     `(("zlib" ,zlib)
+       ("openssl" ,openssl)
+       ("libevent" ,libevent)))
+    (home-page "http://www.torproject.org/")
+    (synopsis "An anonymous network router to improve privacy on the Internet")
+    (description
+     "Tor protects you by bouncing your communications around a distributed
+network of relays run by volunteers all around the world: it prevents
+somebody watching your Internet connection from learning what sites you
+visit, and it prevents the sites you visit from learning your physical
+location. Tor works with many of your existing applications, including
+web browsers, instant messaging clients, remote login, and other
+applications based on the TCP protocol.")
+    (license bsd-3)))