gnu: Add libpng.

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

gnu/packages/libpng.scm

@@ -0,0 +1,46 @@
+;;; 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 libpng)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages compression)
+  #:use-module ((guix licenses) #:renamer (symbol-prefix-proc 'license:))
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu))
+
+(define-public libpng
+  (package
+   (name "libpng")
+   (version "1.5.13")
+   (source (origin
+            (method url-fetch)
+            (uri (string-append
+                   "http://downloads.sourceforge.net/project/libpng/libpng15/"
+                   version "/libpng-"
+                   version ".tar.gz"))
+            (sha256 (base32
+                     "0dbh332qjhm3pa8m4ac73rk7dbbmigbqd3ch084m24ggg9qq4k0d"))))
+   (build-system gnu-build-system)
+   (inputs `(("zlib" ,zlib)))
+   (synopsis "Libpng, a library for handling PNG files")
+   (description
+    "Libpng is the official PNG (Portable Network Graphics) reference
+library. It supports almost all PNG features and is extensible.")
+   (license license:zlib)
+   (home-page "http://www.libpng.org/pub/png/libpng.html")))