anchor.diff:      ++ optional zlibSupport zlib
       ++ optionals stdenv.isDarwin [ darwinArchUtility darwinSwVersUtility ];
   
  -    
  +
     # Build the basic Python interpreter without modules that have
     # external dependencies.
     python = stdenv.mkDerivation {
       name = "python-${version}";
  -    
  +
       inherit majorVersion version src patches buildInputs;
   
       C_INCLUDE_PATH = concatStringsSep ":" (map (p: "${p}/include") buildInputs);
  
positive.code:     };
  
    };
    
  in python // { inherit modules; }
  
negative.code:     url = "http://www.python.org/ftp/python/${version}/Python-${version}.tar.bz2";
      sha256 = "14i2c7yqa7ljmx2i2bb827n61q33zn23ax96czi8rbkyyny8gqw0";
    };
  
    patches =
      [ # Look in C_INCLUDE_PATH and LIBRARY_PATH for stuff.
        ./search-path.patch
  