anchor.diff:      { description = "Secure bitcoin trading client";
         homepage = https://centrabit.com/;
         license = licenses.lgpl3;
  -      platforms = platforms.linux;  # arbitrary choice
  +      platforms = qt.meta.platforms;
         maintainers = [ maintainers.emery ];
       };
   }
  
positive.code:   src = fetchFromGitHub {
      owner = "JulyIGHOR";
      repo = "QtBitcoinTrader";
      rev = "452db3ee9447b8f9e7d63253f834b31394b23d92";
      sha256 = "1l2a021dy2j4sr4nmq7wn27r2zli9nigwbviqzain3nlyzq9fjpg";
    };
  
    buildInputs = [ qt ];
  
negative.code: { stdenv, fetchFromGitHub, qt }:
  
  let
    version = "1.08.03";
  in
  stdenv.mkDerivation {
    name = "qtbitcointrader-${version}";
  