anchor.diff:  }:
   
   let
  -  inherit (stdenv.lib)
  -    scFlag;
  +  inherit (lib)
  +    bool01;
   in
  -
   stdenv.mkDerivation rec {
  -  name = "mixxx-${version}";
  -  version = "2.0.0";
  +  name = "mixxx-2.0.0";
   
     src = fetchurl {
       url = "https://downloads.mixxx.org/${name}/${name}-src.tar.gz";
  -    sha256 = "0vb71w1yq0xwwsclrn2jj9bk8w4n14rfv5c0aw46c11mp8xz7f71";
  +    sha256 = "e1b8f33bba35046608578095ed3209967034579252d84c99e6bc03ec030f676d";
     };
   
     nativeBuildInputs = [
  
positive.code:     "verbose=0"
      "profiling=0"
      "test=0"
      (scFlag "shoutcast" (libshout != null))
      (scFlag "opus" (opus != null))
      (scFlag "ffmpeg" (ffmpeg_2 != null))
      "optimize=portable"
      "autodjcrates=1"
      "macappstore=0"
  
negative.code: 
      "opengles=0"
      "hss1394=0"
      "hid=${bool01 (libusb != null)}"
      "bulk=${bool01 (libusb != null)}"
      "mad=${bool01 (libmad != null)}"
      "coreaudio=0"
      "mediafoundation=0"
      "ipod=0"
      "vinylcontrol=1"
      "vamp=${bool01 (vamp.vampSDK != null)}"
      "modplug=${bool01 (libmodplug != null)}"
      "faad=${bool01 (faad2 != null)}"
      "wv=${bool01 (wavpack != null)}"
      "color=0"
      "asan=0"
      "perftools=0"
  