anchor.diff: -{ lib, stdenv, buildPythonPackage, python, isPy3k, arrow-cpp, cmake, cython, hypothesis, numpy, pandas, pytestCheckHook, pytest-lazy-fixture, pkg-config, setuptools-scm, six }:
  +{ lib
  +, stdenv
  +, buildPythonPackage
  +, python
  +, isPy3k
  +, arrow-cpp
  +, cmake
  +, cython
  +, hypothesis
  +, numpy
  +, pandas
  +, pytestCheckHook
  +, pytest-lazy-fixture
  +, pkg-config
  +, setuptools-scm
  +, six
  +}:
   
   let
     zero_or_one = cond: if cond then 1 else 0;
  
positive.code:     maintainers = with maintainers; [ veprbl cpcloud ];
    };
  }
  
negative.code: 
    nativeBuildInputs = [ cmake cython pkg-config setuptools-scm ];
    propagatedBuildInputs = [ numpy six ];
    checkInputs = [
      hypothesis
      pandas
      pytestCheckHook
      pytest-lazy-fixture
    ];
  
    PYARROW_BUILD_TYPE = "release";
  
  