anchor.diff:        python setup.py test
         runHook postCheck
       ''
  -, configurePhase ? "true"
  -
   , postInstall ? ""
   
   , ... } @ attrs:
  
positive.code:       easy_install --always-unzip --prefix="$out" .
      ''
      
  , buildPhase ? "true"
  
  , doCheck ? true
  
negative.code: 
    buildInputStrings = map toString buildInputs;
  
    pythonPath = [ setuptools ] ++ pythonPath;
  
    preConfigure = ''
      PYTHONPATH="${offlineDistutils}/lib/${python.libPrefix}/site-packages:$PYTHONPATH"
      ${preConfigure}
    '';
  
    installPhase = ''
      mkdir -p "$out/lib/${python.libPrefix}/site-packages"
  