anchor.diff:      python.packages."lxml"
       python.packages."ZODB"
     ];
  +
     checkPhase = ''
       export PYTHONPATH=src:$PYTHONPATH
       py.test
  
positive.code: let
    python = import ./requirements.nix { inherit pkgs; };
    version = pkgs.lib.removeSuffix "\n" (builtins.readFile ./VERSION);
  in
  python.mkDerivation {
    inherit version;
    name = "vulnix-${version}";
  
    src = ./.;
    buildInputs = [
      python.packages."flake8"
      python.packages."pytest"
  
negative.code:     python.packages."pytest-cov"
      python.packages."pytest-timeout"
    ];
  
    propagatedBuildInputs = [
      pkgs.nix
      python.packages."click"
      python.packages."colorama"
  