gnu: Add libmad.

* gnu/packages/mp3.scm: New file.
* Makefile.am (MODULES): Add it.

Makefile.am

@@ -106,6 +106,7 @@ MODULES =					\
   gnu/packages/mailutils.scm			\
   gnu/packages/make-bootstrap.scm		\
   gnu/packages/mit-krb5.scm			\
+  gnu/packages/mp3.scm				\
   gnu/packages/multiprecision.scm		\
   gnu/packages/mysql.scm			\
   gnu/packages/nano.scm				\

gnu/packages/mp3.scm

@@ -0,0 +1,61 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013 Andreas Enge <andreas@enge.fr>
+;;;
+;;; 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 mp3)
+  #:use-module ((guix licenses)
+                #:renamer (symbol-prefix-proc 'license:))
+  #:use-module (gnu packages autotools)
+  #:use-module (gnu packages oggvorbis)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu))
+
+(define-public libmad
+  (package
+   (name "libmad")
+   (version "0.15.1b")
+   (source (origin
+            (method url-fetch)
+            (uri (string-append "mirror://sourceforge/mad/libmad/"
+                                version "/libmad-"
+                                version ".tar.gz"))
+            (sha256
+             (base32
+              "14460zhacxhswnzb36qfpd1f2wbk10qvksvm6wyq5hpvdgnw7ymv"))))
+   (build-system gnu-build-system)
+   (arguments
+    `(#:phases
+       (alist-replace
+        'configure
+        (lambda* (#:key #:allow-other-keys #:rest args)
+         (let ((configure (assoc-ref %standard-phases 'configure)))
+           ;; remove option that is not supported by gcc any more
+           (substitute* "configure" ((" -fforce-mem") ""))
+           (apply configure args)))
+       %standard-phases)))
+   (synopsis "libmad, an MPEG audio decoder")
+   (description
+    "MAD (MPEG Audio Decoder) supports MPEG-1 and the MPEG-2 extension to
+lower sampling frequencies, as well as the de facto MPEG 2.5 format.
+All three audio layers — Layer I, Layer II, and Layer III (i.e. MP3) — are
+fully implemented.
+
+This package contains the library.")
+   (license license:gpl2+)
+   (home-page "http://www.underbit.com/products/mad/")))
+