anchor.diff:      homepage = "https://bitcoin.org/";
       downloadPage = "https://bitcoincore.org/bin/bitcoin-core-${version}/";
       changelog = "https://bitcoincore.org/en/releases/${version}/";
  -    maintainers = with maintainers; [ roconnor ];
  +    maintainers = with maintainers; [ prusnak roconnor ];
       license = licenses.mit;
       platforms = platforms.unix;
     };
  
positive.code: , qrencode
  , libevent
  , withGui
  }:
  
  with stdenv.lib;
  
negative.code: { stdenv
  , fetchurl
  , pkg-config
  , autoreconfHook
  , db48
  , boost
  