anchor.diff:  , buildPythonApplication
   , fetchFromGitHub
   , gitMinimal
  -, arrow
  -, click
  -, sh
  -, wheel
  +, python3
   }:
  +
  +let
  +  py = python3.override {
  +    packageOverrides = self: super: {
  +
  +      click = super.click.overridePythonAttrs (oldAttrs: rec {
  +        version = "7.1.2";
  +        src = oldAttrs.src.override {
  +          inherit version;
  +          sha256 = "06kbzd6sjfkqan3miwj9wqyddfxc2b6hi7p5s4dvqjb3gif2bdfj";
  +        };
  +      });
  +
  +      arrow = super.arrow.overridePythonAttrs (oldAttrs: rec {
  +        version = "1.0.3";
  +        src = oldAttrs.src.override {
  +          inherit version;
  +          sha256 = "0793badh4hgbk2c5g70hmbl7n3d4g5d87bcflld0w9rjwy59r71r";
  +        };
  +      });
  +
  +      sh = super.sh.overridePythonAttrs (oldAttrs: rec {
  +        version = "1.14.1";
  +        src = oldAttrs.src.override {
  +          inherit version;
  +          sha256 = "13hxgifab9ichla13qaa7sh8r0il7vs1r21js72s0n355zr9mair";
  +        };
  +      });
  +    };
  +  };
  +in
  +with py.pkgs;
   
   buildPythonApplication rec {
     pname = "gitlint";
  
positive.code:     gitMinimal
    ];
  
    meta = {
      description = "Linting for your git commit messages";
      homepage = "http://jorisroovers.github.io/gitlint";
      license = lib.licenses.mit;
      maintainers = with lib.maintainers; [ ethancedwards8 ];
    };
  }
  
negative.code:     sha256 = "sha256-CqmE4V+svSuQAsoX0I3NpUqPU5CQf3fyCHJPrjUjHF4=";
    };
  
    nativeBuildInputs = [
      wheel
    ];
  
    propagatedBuildInputs = [
      arrow
  