anchor.diff: -{ stdenv, fetchurl, fetchFromGitHub, pkgconfig, perl, python3
  +{ stdenv, fetchurl, fetchFromGitHub, pkgconfig, perl, python3, which
   , libX11, libxcb, qt5, mesa
   , ffmpeg
   , libchardet
  
positive.code:                    ++ optional cddaSupport "--enable-cdda"
                     ;
  
    nativeBuildInputs = [ pkgconfig perl ];
  
    enableParallelBuilding = true;
  
  
negative.code: 
  stdenv.mkDerivation rec {
    name = "bomi-${version}";
    version = "0.9.5";
  
    src = fetchFromGitHub {
      owner = "xylosper";
      repo = "bomi";
      rev = "v${version}";
      sha256 = "1pf82dp7v18yd7knsjl853sfzhq4rqc3sq15jgqiw37096gp0sll";
    };
  
    buildInputs = with stdenv.lib;
  