anchor.diff:  { stdenv
  +, lib
   , fetchFromGitLab
  -, fetchpatch
   , meson
   , ninja
  +, systemd
   , pkgconfig
   , doxygen
   , graphviz
   , valgrind
   , glib
   , dbus
  -, gst_all_1
   , alsaLib
  -, ffmpeg_3
   , libjack2
   , udev
   , libva
  -, xorg
  -, sbc
  -, SDL2
   , libsndfile
  -, bluez
   , vulkan-headers
   , vulkan-loader
   , libpulseaudio
   , makeFontsConf
   , callPackage
   , nixosTests
  +, gstreamerSupport ? true, gst_all_1 ? null
  +, ffmpegSupport ? true, ffmpeg ? null
  +, bluezSupport ? true, bluez ? null, sbc ? null
  +, nativeHspSupport ? true
   , ofonoSupport ? true
  -, nativeHspSupport ? true
  +, hsphfpdSupport ? false
   }:
   
   let
     fontsConf = makeFontsConf {
       fontDirectories = [];
     };
  +
  +  mesonBool = b: if b then "true" else "false";
   in
   stdenv.mkDerivation rec {
     pname = "pipewire";
  -  version = "0.3.11";
  +  version = "0.3.12";
   
     outputs = [
       "out"
  
positive.code:     meson
      ninja
      pkgconfig
      valgrind
    ];
  
    buildInputs = [
      SDL2
      alsaLib
      bluez
      dbus
      ffmpeg_3
      glib
      gst_all_1.gst-plugins-base
      gst_all_1.gstreamer
      libjack2
      libpulseaudio
      libsndfile
      libva
      sbc
      udev
      vulkan-headers
      vulkan-loader
      xorg.libX11
    ];
  
    mesonFlags = [
      "-Ddocs=true"
      "-Dman=false" # we don't have xmltoman
      "-Dgstreamer=true"
      "-Dudevrulesdir=lib/udev/rules.d"
      "-Dinstalled_tests=true"
      "-Dlibpulse-path=${placeholder "pulse"}/lib"
      "-Dlibjack-path=${placeholder "jack"}/lib"
    ] ++ stdenv.lib.optional nativeHspSupport "-Dbluez5-backend-native=true"
    ++ stdenv.lib.optional ofonoSupport "-Dbluez5-backend-ofono=true";
  
    FONTCONFIG_FILE = fontsConf; # Fontconfig error: Cannot load default config file
  
  
negative.code:     owner = "pipewire";
      repo = "pipewire";
      rev = version;
      sha256 = "14w9sgznrvcs31qzbzz1vyp4p2sljawbrzhr93921ss0iqivhfwl";
    };
  
    patches = [
  