gnu: Add Augeas.

* gnu/packages/augeas.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

gnu-system.am

@@ -42,6 +42,7 @@ GNU_SYSTEM_MODULES =				\
   gnu/packages/attr.scm				\
   gnu/packages/audacity.scm			\
   gnu/packages/audio.scm			\
+  gnu/packages/augeas.scm			\
   gnu/packages/autogen.scm			\
   gnu/packages/autotools.scm			\
   gnu/packages/avahi.scm			\

gnu/packages/augeas.scm

@@ -0,0 +1,59 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
+;;;
+;;; 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 augeas)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix utils)
+  #:use-module (guix build-system gnu)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages readline)
+  #:use-module (gnu packages pkg-config)
+  #:use-module (gnu packages xml))
+
+(define-public augeas
+  (package
+    (name "augeas")
+    (version "1.4.0")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "http://download.augeas.net/augeas-"
+                                  version ".tar.gz"))
+              (sha256
+               (base32
+                "0c2vncn0afmgwggnqa5s5z7m3zbcc66bi8v9m1h9w0i9q9xax7v5"))))
+    (build-system gnu-build-system)
+    ;; Marked as "required" in augeas.pc
+    (propagated-inputs
+     `(("libxml2" ,libxml2)))
+    (inputs
+     `(("readline" ,readline)))
+    (native-inputs
+     `(("pkg-config" ,pkg-config)))
+    (home-page "http://augeas.net/")
+    (synopsis "Edit configuration files programmatically")
+    (description
+     "Augeas is a library and command line tool for programmatically editing
+configuration files in a controlled manner.  Augeas exposes a tree of all
+configuration settings and a simple local API for manipulating the tree.
+Augeas then modifies underlying configuration files according to the changes
+that have been made to the tree; it does as little modeling of configurations
+as possible, and focuses exclusivley on transforming the tree-oriented syntax
+of its public API to the myriad syntaxes of individual configuration files.")
+    (license license:lgpl2.1+)))