Add GNU Screen.

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

Makefile.am

@@ -115,6 +115,7 @@ MODULES =					\
   gnu/packages/recutils.scm			\
   gnu/packages/rsync.scm			\
   gnu/packages/scheme.scm			\
+  gnu/packages/screen.scm 			\
   gnu/packages/shishi.scm			\
   gnu/packages/system.scm			\
   gnu/packages/tcl.scm				\

gnu/packages/screen.scm

@@ -0,0 +1,61 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013 Cyril Roelandt <tipecaml@gmail.com>
+;;;
+;;; 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 screen)
+  #:use-module (guix licenses)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages ncurses)
+  #:use-module (gnu packages perl))
+
+(define-public screen
+  (package
+    (name "screen")
+    (version "4.0.3")
+    (source (origin
+             (method url-fetch)
+             (uri (string-append "http://ftp.gnu.org/gnu/screen/screen-"
+                                 version ".tar.gz"))
+             (sha256
+              (base32 "0xvckv1ia5pjxk7fs4za6gz2njwmfd54sc464n8ab13096qxbw3q"))))
+    (build-system gnu-build-system)
+    (inputs
+     `(("ncurses", ncurses)
+       ("perl" ,perl)))
+    (home-page "http://www.gnu.org/software/screen/")
+    (synopsis "GNU Screen, a terminal multiplexer")
+    (description
+     "GNU screen is a full-screen window manager that multiplexes a physical
+terminal between several processes, typically interactive shells. Each virtual
+terminal provides the functions of the DEC VT100 terminal and, in addition,
+several control functions from the ANSI X3.64 (ISO 6429) and ISO 2022 standards
+(e.g., insert/delete line and support for multiple character sets). There is a
+scrollback history buffer for each virtual terminal and a copy-and-paste
+mechanism that allows the user to move text regions between windows. When
+screen is called, it creates a single window with a shell in it (or the
+specified command) and then gets out of your way so that you can use the
+program as you normally would. Then, at any time, you can create new
+(full-screen) windows with other programs in them (including more shells), kill
+the current window, view a list of the active windows, turn output logging on
+and off, copy text between windows, view the scrollback history, switch between
+windows, etc. All windows run their programs completely independent of each
+other. Programs continue to run when their window is currently not visible and
+even when the whole screen session is detached from the users terminal.")
+    (license "gpl2")))