nongnu: Add unrar.

* nongnu/packages/compression.scm: New file.
(unrar): New variable.

nongnu/packages/compression.scm

@@ -0,0 +1,48 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2019 Pierre Neidhardt <mail@ambrevar.xyz>
+;;;
+;;; This file is not 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 (nongnu packages compression)
+  #:use-module (guix packages)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix download)
+  #:use-module (nonguix licenses))
+
+(define-public unrar
+  (package
+    (name "unrar")
+    (version "5.7.3")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "https://www.rarlab.com/rar/unrarsrc-"
+                                  version
+                                  ".tar.gz"))
+              (sha256
+               (base32
+                "0i5442sh18v9s47k1j8q04m3ki98z012rw7ml7c5iwklhfvmds20"))))
+    (build-system gnu-build-system)
+    (arguments
+     '(#:tests? #f                      ; No tests.
+       #:make-flags (list (string-append "DESTDIR=" (assoc-ref %outputs "out")))
+       #:phases
+       (modify-phases %standard-phases
+         (delete 'configure))))
+    (home-page "https://www.rarlab.com/rar_add.htm")
+    (synopsis "Extract files from RAR archives")
+    (description "The RAR decompression program.  It is nonfree (as in
+freedom), but open-source.")
+    (license (nonfree "https://www.win-rar.com/gtb_priv.html?&L=0"))))