gnu: Add rtl-sdr.

* gnu/packages/ham-radio.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* gnu/packages/ham-radio.scm (rtl-sdr): New variable.

gnu/local.mk

@@ -196,6 +196,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/packages/gv.scm				\
   %D%/packages/gxmessage.scm			\
   %D%/packages/haskell.scm			\
+  %D%/packages/ham-radio.scm			\
   %D%/packages/hexedit.scm			\
   %D%/packages/hugs.scm				\
   %D%/packages/hurd.scm				\

gnu/packages/ham-radio.scm

@@ -0,0 +1,52 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2017 Arun Isaac <arunisaac@systemreboot.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 ham-radio)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (gnu packages libusb)
+  #:use-module (gnu packages pkg-config)
+  #:use-module (guix build-system cmake))
+
+(define-public rtl-sdr
+  (package
+    (name "rtl-sdr")
+    (version "0.5.3")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append "https://cgit.osmocom.org/rtl-sdr/snapshot/rtl-sdr-"
+                           version ".tar.xz"))
+       (sha256
+        (base32
+         "08awca3v28sa4lxym4r81pzf0la0j86wbmpyhv3xd53an9gkpjy9"))))
+    (build-system cmake-build-system)
+    (inputs
+     `(("libusb" ,libusb)))
+    (native-inputs
+     `(("pkg-config" ,pkg-config)))
+    (arguments
+     `(#:configure-flags '("-DDETACH_KERNEL_DRIVER=ON")
+       #:tests? #f)) ; No tests
+    (home-page "https://osmocom.org/projects/sdr/wiki/rtl-sdr")
+    (synopsis "Software defined radio driver for Realtek RTL2832U")
+    (description "DVB-T dongles based on the Realtek RTL2832U can be used as a
+cheap software defined radio, since the chip allows transferring the raw I/Q
+samples to the host.  @code{rtl-sdr} provides drivers for this purpose.")
+    (license license:gpl2+)))