Merge branch 'master' into staging

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diff --git a/gnu/packages/sdr.scm b/gnu/packages/sdr.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2019 Christopher Howard <christopher@librehacker.com>
+;;;
+;;; 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 sdr)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix packages)
+  #:use-module (guix utils)
+  #:use-module (guix download)
+  #:use-module (guix git-download)
+  #:use-module (guix build-system gnu)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages algebra)
+  #:use-module (gnu packages autotools))
+
+(define-public liquid-dsp
+  (package
+    (name "liquid-dsp")
+    (version "1.3.2")
+    (source
+     (origin (method git-fetch)
+             (uri (git-reference
+                   (url "https://github.com/jgaeddert/liquid-dsp.git")
+                   (commit (string-append "v" version))))
+             (file-name (git-file-name name version))
+             (sha256
+              (base32 "1n6dbg13q8ga5qhg1yiszwly4jj0rxqr6f1xwm9waaly5z493xsd"))))
+    (build-system gnu-build-system)
+    (native-inputs
+     `(("autoconf" ,autoconf)))
+    (inputs
+     `(("fftw" ,fftw)
+       ("fftwf" ,fftwf)))
+    (home-page "https://liquidsdr.org")
+    (synopsis "Signal processing library for software-defined radios")
+    (description
+     "Liquid DSP is a @dfn{digital signal processing} (DSP) library designed
+specifically for software-defined radios on embedded platforms.  The aim is to
+provide a lightweight DSP library that does not rely on a myriad of external
+dependencies or proprietary and otherwise cumbersome frameworks.  All signal
+processing elements are designed to be flexible, scalable, and dynamic,
+including filters, filter design, oscillators, modems, synchronizers, complex
+mathematical operations, and much more.")
+    (license license:expat)))