anchor.diff:      description = "Synchronous multi-room audio player";
       homepage = "https://github.com/badaix/snapcast";
       maintainers = with maintainers; [ fpletz ];
  -    license = licenses.gpl3;
  +    license = licenses.gpl3Plus;
     };
   }
  
positive.code: 
    aixlog = dependency {
      name    = "aixlog";
      version = "1.4.0";
      sha256  = "0f2bs5j1jjajcpa251dslnwkgglaam3b0cm6wdx5l7mbwvnmib2g";
    };
  
    popl = dependency {
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "snapcast";
    version = "0.24.0";
  
    src = fetchFromGitHub {
      owner  = "badaix";
      repo   = "snapcast";
      rev    = "v${version}";
      sha256 = "13yz8alplnqwkcns3mcli01qbyy6l3h62xx0v71ygcrz371l4g9g";
    };
  
    nativeBuildInputs = [ cmake pkg-config boost170.dev ];
  