codec2: add freedv support

pkgs/development/libraries/codec2/default.nix

···
-{ lib, stdenv, fetchFromGitHub, cmake }:
+{ lib
+, stdenv
+, fetchFromGitHub
+, cmake
+, freedvSupport ? false
+, lpcnetfreedv
+, codec2
+}:
 
 stdenv.mkDerivation rec {
   pname = "codec2";
···
 
   nativeBuildInputs = [ cmake ];
 
+  buildInputs = lib.optionals freedvSupport [
+    lpcnetfreedv
+  ];
+
   # Install a binary that is used by openwebrx
   postInstall = ''
     install -Dm0755 src/freedv_rx -t $out/bin/
···
   cmakeFlags = [
     # RPATH of binary /nix/store/.../bin/freedv_rx contains a forbidden reference to /build/
     "-DCMAKE_SKIP_BUILD_RPATH=ON"
+  ] ++ lib.optionals freedvSupport [
+    "-DLPCNET=ON"
   ];
 
   meta = with lib; {

pkgs/top-level/all-packages.nix

···
 
   freedv = callPackage ../applications/radio/freedv {
     inherit (darwin.apple_sdk.frameworks) AppKit AVFoundation Cocoa CoreMedia;
+    codec2 = codec2.override {
+      freedvSupport = true;
+    };
   };
 
   freemind = callPackage ../applications/misc/freemind {