anchor.diff: -{ lib, buildPythonPackage, python, isPy3k, fetchurl, arrow-cpp, cmake, cython, futures, JPype1, numpy, pandas, pytest, pytestrunner, pkgconfig, setuptools_scm, six }:
  +{ lib, buildPythonPackage, python, isPy3k, fetchurl, arrow-cpp, cmake, cython, futures, JPype1, numpy, pandas, pytest, pkgconfig, setuptools_scm, six }:
   
   let
     _arrow-cpp = arrow-cpp.override { inherit python; };
  
positive.code: 
    setupPyBuildFlags = ["--with-parquet" ];
  
    meta = with lib; {
      description = "A cross-language development platform for in-memory data";
      homepage = https://arrow.apache.org/;
  
negative.code: 
    nativeBuildInputs = [ cmake cython pkgconfig setuptools_scm ];
    propagatedBuildInputs = [ numpy six ] ++ lib.optionals (!isPy3k) [ futures ];
    checkInputs = [ pandas pytest JPype1 ];
  
    PYARROW_BUILD_TYPE = "release";
    PYARROW_CMAKE_OPTIONS = "-DCMAKE_INSTALL_RPATH=${ARROW_HOME}/lib";
  