gqrx: update support for different audio backends

pkgs/applications/radio/gqrx/default.nix

@@ -14,9 +14,13 @@
 , rtl-sdr
 , hackrf
 , pulseaudioSupport ? true, libpulseaudio
+, portaudioSupport ? false, portaudio
 }:
 
 assert pulseaudioSupport -> libpulseaudio != null;
+assert portaudioSupport -> portaudio != null;
+# audio backends are mutually exclusive
+assert !(pulseaudioSupport && portaudioSupport);
 
 gnuradio3_8Minimal.pkgs.mkDerivation rec {
   pname = "gqrx";
@@ -49,7 +53,20 @@ gnuradio3_8Minimal.pkgs.mkDerivation rec {
   ] ++ lib.optionals (gnuradio3_8Minimal.hasFeature "gr-ctrlport") [
     thrift
     gnuradio3_8Minimal.unwrapped.python.pkgs.thrift
-  ] ++ lib.optionals pulseaudioSupport [ libpulseaudio ];
+  ] ++ lib.optionals pulseaudioSupport [ libpulseaudio ]
+    ++ lib.optionals portaudioSupport [ portaudio ];
+
+  cmakeFlags =
+    let
+      audioBackend =
+        if pulseaudioSupport
+        then "Pulseaudio"
+        else if portaudioSupport
+        then "Portaudio"
+        else "Gr-audio";
+    in [
+      "-DLINUX_AUDIO_BACKEND=${audioBackend}"
+    ];
 
   postInstall = ''
     install -vD $src/gqrx.desktop -t "$out/share/applications/"

pkgs/top-level/all-packages.nix

@@ -25136,6 +25136,14 @@ with pkgs;
   gpx = callPackage ../applications/misc/gpx { };
 
   gqrx = callPackage ../applications/radio/gqrx { };
+  gqrx-portaudio = callPackage ../applications/radio/gqrx {
+    portaudioSupport = true;
+    pulseaudioSupport = false;
+  };
+  gqrx-gr-audio = callPackage ../applications/radio/gqrx {
+    portaudioSupport = false;
+    pulseaudioSupport = false;
+  };
 
   gpx-viewer = callPackage ../applications/misc/gpx-viewer { };