anchor.diff:        in ''
         patch lib-python/2.7/test/test_pyexpat.py < '${expatch}'
       '';
  -
  -    # Increase recursion limit. This patch is not needed on pypy > 5.4.0
  -    patches = [
  -      (fetchurl {
  -        url = "https://bitbucket.org/pypy/pypy/commits/a5db0f4359abb3f64b6d7ed83202e1cb0de37fb2/raw/";
  -        sha256 = "07nvqjhj0kl67f3kjwhmybaqg6089ps3q8r0si1lgk3gyb56ygn0";
  -      })
  -    ];
   
       buildInputs = [ bzip2 openssl pkgconfig pythonFull libffi ncurses expat sqlite tk tcl xlibsWrapper libX11 makeWrapper gdbm db ]
         ++ stdenv.lib.optional (stdenv ? cc && stdenv.cc.libc != null) stdenv.cc.libc
  
positive.code: 
  let
  
    majorVersion = "5.4.0";
    version = "${majorVersion}";
    libPrefix = "pypy${majorVersion}";
  
  
negative.code: 
      src = fetchurl {
        url = "https://bitbucket.org/pypy/pypy/get/release-pypy${pythonVersion}-v${version}.tar.bz2";
        sha256 = "1x8sa5x1nkrb8wrmicri94ji8kvyxihyryi8br5fk7gak0agcai0";
      };
  
     # http://bugs.python.org/issue27369
  