anchor.diff:  
   let
   
  -  majorVersion = "4.0";
  -  version = "${majorVersion}.1";
  +  majorVersion = "5.1.1";
  +  version = "${majorVersion}";
     libPrefix = "pypy${majorVersion}";
   
     pypy = stdenv.mkDerivation rec {
  
positive.code:        # disable test_zipfile64 because it randomly timeouts
         # disable test_cpickle because timeouts
         # disable test_ssl because no shared cipher' not found in '[Errno 1] error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure
        ./pypy-c ./pypy/test_all.py --pypy=./pypy-c -k 'not (test_ssl or test_cpickle or test_sqlite or test_urllib2net or test_urllibnet or test_urllib2_localnet or test_socket or test_os or test_shutil or test_mhlib or test_multiprocessing or test_zipfile64)' lib-python
      '';
  
      installPhase = ''
  
negative.code: 
      src = fetchurl {
        url = "https://bitbucket.org/pypy/pypy/get/release-${version}.tar.bz2";
        sha256 = "1dmckvffanmh0b50pq34shnw05r55gjxn43kgvnkz5kkvvsbxdg1";
      };
  
      buildInputs = [ bzip2 openssl pkgconfig pythonFull libffi ncurses expat sqlite tk tcl xlibsWrapper libX11 makeWrapper gdbm db ]
  