anchor.diff:        --replace "Exec=electrum %u" "Exec=$out/bin/electrum %u"
     '';
   
  -  doCheck = false;
  +  checkInputs = with python3Packages; [ pytest ];
   
  -  doInstallCheck = true;
  -  installCheckPhase = ''
  +  checkPhase = ''
  +    py.test electrum/tests
       $out/bin/electrum help >/dev/null
     '';
   
  
positive.code:   pname = "electrum";
    version = "3.3.2";
  
    src = fetchurl {
      url = "https://download.electrum.org/${version}/Electrum-${version}.tar.gz";
      sha256 = "0vgfdhwvrrl6dr4rd4hhxr8304bxm00sh7fw4nalm4hf7gfsbcji";
    };
  
    propagatedBuildInputs = with python3Packages; [
  
negative.code: { stdenv, fetchFromGitHub, python3, python3Packages, zbar, secp256k1 }:
  
  let
    qdarkstyle = python3Packages.buildPythonPackage rec {
  