anchor.diff:  @rem script execution
   call conda create -p %_VERIFICATION_CONDA_ENV% -f -q -y python=%PYTHON% || exit /B
   
  -call activate %_VERIFICATION_CONDA_ENV%
  +call activate %_VERIFICATION_CONDA_ENV% || exit /B
   
   call conda install -y ^
         six pytest setuptools numpy pandas cython ^
  
positive.code: set INSTALL_DIR=%_VERIFICATION_DIR%\install
  
  @rem Requires GNU Wget for Windows
  wget -O %_TARBALL% %_DIST_URL%/apache-arrow-%1-rc%2/%_TARBALL%
  
  tar xvf %_TARBALL% -C %_VERIFICATION_DIR_UNIX%
  
  set PYTHON=3.6
  
  
negative.code: 
  cmake -G "%GENERATOR%" ^
        -DCMAKE_INSTALL_PREFIX=%ARROW_HOME% ^
        -DARROW_BOOST_USE_SHARED=ON ^
        -DCMAKE_BUILD_TYPE=%CONFIGURATION% ^
        -DARROW_CXXFLAGS="/MP" ^
        -DARROW_PYTHON=ON ^
        -DARROW_PARQUET=ON ^
        ..  || exit /B
  cmake --build . --target INSTALL --config %CONFIGURATION%  || exit /B
  
  @rem Get testing datasets for Parquet unit tests
  git clone https://github.com/apache/parquet-testing.git %_VERIFICATION_DIR%\parquet-testing
  set PARQUET_TEST_DATA=%_VERIFICATION_DIR%\parquet-testing\data
  
  @rem Needed so python-test.exe works
  set PYTHONPATH=%CONDA_PREFIX%\Lib;%CONDA_PREFIX%\Lib\site-packages;%CONDA_PREFIX%\python35.zip;%CONDA_PREFIX%\DLLs;%CONDA_PREFIX%;%PYTHONPATH%
  