gnu: Add GNU gcal.

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

Makefile.am

@@ -101,6 +101,7 @@ MODULES =					\
   gnu/packages/fontutils.scm			\
   gnu/packages/freeipmi.scm			\
   gnu/packages/gawk.scm				\
+  gnu/packages/gcal.scm				\
   gnu/packages/gcc.scm				\
   gnu/packages/gdb.scm				\
   gnu/packages/gdbm.scm				\

gnu/packages/gcal.scm

@@ -0,0 +1,49 @@
+;;; 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 gcal)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix licenses))
+
+(define-public gcal
+  (package
+    (name "gcal")
+    (version "3.6.3")
+    (source (origin
+             (method url-fetch)
+             (uri (string-append "mirror://gnu/gcal/gcal-"
+                                 version ".tar.xz"))
+             (sha256
+              (base32
+               "06xkwkir9w4jd9i72m1izmf4rbry4slg8gkiml4w26h13lx92hk7"))))
+    (build-system gnu-build-system)
+    (home-page "http://www.gnu.org/software/gcal")
+    (synopsis "Calculating and printing a wide variety of calendars")
+    (description
+     "Gcal is a program for calculating and printing calendars.  Gcal displays
+hybrid and proleptic Julian and Gregorian calendar sheets,respectively for one
+month, three months, or a whole year.  It also displays eternal holiday lists
+for many countries around the globe, and features a very powerful creation of
+fixed date lists that can be used for reminding purposes.  Gcal can calculate
+various astronomical data and times of the Sun and the Moon for pleasure at
+any location, precisely enough for most civil purposes.  Gcal supports some
+other calendar systems, for example, the Chinese and Japanese calendars, the
+Hebrew calendar, and the civil Islamic calendar, too.")
+    (license gpl3+)))