anchor.diff:  , makeWrapper, callPackage, self, gdbm, db
   , python-setup-hook
   # For the Python package set
  -, pkgs, pythonPackages, packageOverrides ? (self: super: {})
  +, pkgs, packageOverrides ? (self: super: {})
   }:
   
   assert zlibSupport -> zlib != null;
  
positive.code:     '';
  
      buildPhase = ''
        ${python.interpreter} rpython/bin/rpython --make-jobs="$NIX_BUILD_CORES" -Ojit --batch pypy/goal/targetpypystandalone.py --withmod-_minimal_curses --withmod-unicodedata --withmod-thread --withmod-bz2 --withmod-_multiprocessing
      '';
  
      setupHook = python-setup-hook sitePackages;
  
negative.code:   version = "${majorVersion}.${minorVersion}${minorVersionSuffix}";
    libPrefix = "pypy${majorVersion}";
    sitePackages = "site-packages";
  
    pythonForPypy = python.withPackages (ppkgs: [ ppkgs.pycparser ]);
  
  in stdenv.mkDerivation rec {
      name = "pypy-${version}";
  