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