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diff --git a/gnu/packages/messaging.scm b/gnu/packages/messaging.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2014 Mark H Weaver <mhw@netris.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 messaging)
+  #:use-module (guix licenses)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu)
+  #:use-module (gnu packages gnupg))
+
+(define-public libotr
+  (package
+    (name "libotr")
+    (version "4.0.0")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "https://otr.cypherpunks.ca/libotr-"
+                                  version ".tar.gz"))
+              (sha256
+               (base32 "1d4k0b7v4d3scwm858cmqr9c6xgd6ppla1vk4x2yg64q82a1k49z"))))
+    (build-system gnu-build-system)
+    (propagated-inputs
+     `(("libgcrypt" ,libgcrypt)))  ; libotr headers include gcrypt.h
+    (inputs `(("libgpg-error" ,libgpg-error)))
+    (arguments
+     `(#:configure-flags '("--with-pic")))
+    (synopsis "Off-the-Record (OTR) Messaging Library and Toolkit")
+    (description
+     "OTR allows you to have private conversations over instant messaging by
+providing:
+* Encryption: No one else can read your instant messages.
+* Authentication: You are assured the correspondent is who you think it is.
+* Deniability: The messages you send do not have digital signatures that are
+  checkable by a third party.  Anyone can forge messages after a conversation
+  to make them look like they came from you.  However, during a conversation,
+  your correspondent is assured the messages he sees are authentic and
+  unmodified.
+* Perfect forward secrecy: If you lose control of your private keys, no
+  previous conversation is compromised.")
+    (home-page "https://otr.cypherpunks.ca/")
+    (license (list lgpl2.1 gpl2))))
+
+(define-public libotr-3
+  (package (inherit libotr)
+    (version "3.2.1")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "https://otr.cypherpunks.ca/libotr-"
+                                  version ".tar.gz"))
+              (sha256
+               (base32 "1x6dd4rh499hdraiqfhz81igrj0a5rs0gjhc8l4sljwqhjjyla6l"))))))
+
+;;; messaging.scm ends here