anchor.diff:  
     meta = with stdenv.lib; {
       description = "PulseAudio Volume Control";
  -    homepage = http://freedesktop.org/software/pulseaudio/pavucontrol/ ;
  +    homepage = https://freedesktop.org/software/pulseaudio/pavucontrol/ ;
       license = licenses.gpl2Plus;
       maintainers = with maintainers; [
         codyopel
  
positive.code:     pulseaudio_lib
    ];
  
    configureFlags = [
      (enFlag "gtk3" (gtkmm_3 != null) null)
      "--disable-lynx"
      "--enable-nls"
    ];
  
    NIX_CFLAGS_COMPILE = [
      "-std=c++11"
    ];
  
    preFixup = ''
  
negative.code: 
  let
    inherit (stdenv.lib)
      boolEn;
  in
  stdenv.mkDerivation rec {
    name = "pavucontrol-3.0";
  
    src = fetchurl {
      url = "https://freedesktop.org/software/pulseaudio/pavucontrol/${name}.tar.xz";
      sha256 = "14486c6lmmirkhscbfygz114f6yzf97h35n3h3pdr27w4mdfmlmk";
    };
  
  