anchor.diff:  { stdenv
   , fetchurl
  +, lib
   
   , alsa-lib
   , dbus
  
positive.code:     "--enable-jack-port-aliases"
      "--enable-jack-metadata"
      "--enable-jack-version"
      (enFlag "alsa-seq" (alsa-lib != null) null)
      (enFlag "portaudio" (portaudio != null) null)
      (enFlag "dbus" (dbus != null) null)
      "--enable-xunique"
      "--disable-stacktrace"
    ];
  
    meta = with stdenv.lib; {
      description = "Application to control the JACK sound server daemon";
      homepage = http://qjackctl.sourceforge.net/;
      license = licenses.gpl2Plus;
  
negative.code: }:
  
  let
    inherit (lib)
      boolEn
      optionals;
  
    version = "0.4.4";
  in
  stdenv.mkDerivation rec {
    name = "qjackctl-${version}";
  
    src = fetchurl {
      url = "mirror://sourceforge/qjackctl/qjackctl/${version}/${name}.tar.gz";
      sha256 = "531db2f7eca654fd8769a1281dccb54ebca57a0b2a575734d1bafc3896a46ba5";
    };
  
    buildInputs = [
  