anchor.diff:    propagatedBuildInputs = [
       pkgs.python3Packages.flask
       pkgs.python3Packages.flask_login
  +    pkgs.python3Packages.flask_restful
     ];
   }
  
positive.code:           license = licenses.bsd3;
          };
        };
      };
    });
  
  
negative.code:   pkgs = (import <nixpkgs> { }).overridePackages (pkgs: self: {
      # Upstream PR: https://github.com/NixOS/nixpkgs/pull/20590
      python3Packages = self.python3Packages // {
        flask = pkgs.python3Packages.buildPythonPackage {
          name = "flask-0.11.1";
  
          src = pkgs.fetchurl {
  