anchor.diff:        "https://bitcoincore.org/bin/bitcoin-core-${version}/bitcoin-${version}.tar.gz"
         "https://bitcoin.org/bin/bitcoin-core-${version}/bitcoin-${version}.tar.gz"
       ];
  -    sha256 = "ec5a2358ee868d845115dc4fc3ed631ff063c57d5e0a713562d083c5c45efb28";
  +    sha256 = "4bbd62fd6acfa5e9864ebf37a24a04bc2dcfe3e3222f056056288d854c53b978";
     };
   
     nativeBuildInputs =
  
positive.code: 
  with stdenv.lib;
  let
    version = "0.20.0";
    majorMinorVersion = versions.majorMinor version;
    desktop = fetchurl {
      url = "https://raw.githubusercontent.com/bitcoin-core/packaging/${majorMinorVersion}/debian/bitcoin-qt.desktop";
      sha256 = "0cpna0nxcd1dw3nnzli36nf9zj28d2g9jf5y0zl9j18lvanvniha";
    };
    pixmap = fetchurl {
      url = "https://raw.githubusercontent.com/bitcoin/bitcoin/v${version}/share/pixmaps/bitcoin128.png";
      sha256 = "08p7j7dg50jlj783kkgdw037klmx0spqjikaprmbkzgcb620r25d";
    };
  in
  stdenv.mkDerivation rec {
  
negative.code: 
    postInstall = optional withGui ''
      install -Dm644 ${desktop} $out/share/applications/bitcoin-qt.desktop
      install -Dm644 share/pixmaps/bitcoin128.png $out/share/pixmaps/bitcoin128.png
    '';
  
    configureFlags = [
  