installing artoolkit

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Whenever I rosmake artoolkit package I get the following error..

  mkdir -p build
  if [ ! -f ARToolKit-SVN-r311.tar.gz.md5sum ]; then echo "Error: Couldn't find md5sum file ARToolKit-SVN-r311.tar.gz.md5sum" && false; fi
  `rospack find rosbuild`/bin/download_checkmd5.py https://code.ros.org/svn/release/download/thirdparty/ARToolKit-SVN-r311.tar.gz build/ARToolKit-SVN-r311.tar.gz `awk {'print $1'} ARToolKit-SVN-r311.tar.gz.md5sum`
  [rosbuild] Downloading https://code.ros.org/svn/release/download/thirdparty/ARToolKit-SVN-r311.tar.gz to build/ARToolKit-SVN-r311.tar.gz...Traceback (most recent call last):
    File "/opt/ros/electric/ros/core/rosbuild/bin/download_checkmd5.py", line 56, in <module>
      sys.exit(main())
    File "/opt/ros/electric/ros/core/rosbuild/bin/download_checkmd5.py", line 28, in main
      urllib.urlretrieve(uri, dest)
    File "/usr/lib/python2.7/urllib.py", line 91, in urlretrieve
      return _urlopener.retrieve(url, filename, reporthook, data)
    File "/usr/lib/python2.7/urllib.py", line 237, in retrieve
      fp = self.open(url, data)
    File "/usr/lib/python2.7/urllib.py", line 205, in open
      return getattr(self, name)(url)
    File "/usr/lib/python2.7/urllib.py", line 435, in open_https
      h.endheaders(data)
    File "/usr/lib/python2.7/httplib.py", line 951, in endheaders
      self._send_output(message_body)
    File "/usr/lib/python2.7/httplib.py", line 811, in _send_output
      self.send(msg)
    File "/usr/lib/python2.7/httplib.py", line 773, in send
      self.connect()
    File "/usr/lib/python2.7/httplib.py", line 1158, in connect
      self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file)
    File "/usr/lib/python2.7/ssl.py", line 344, in wrap_socket
      ciphers=ciphers)
    File "/usr/lib/python2.7/ssl.py", line 121, in __init__
      self.do_handshake()
    File "/usr/lib/python2.7/ssl.py", line 283, in do_handshake
      self._sslobj.do_handshake()
  IOError: [Errno socket error] [Errno 1] _ssl.c:499: error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol

The md5sum file that is shown missing is present in artoolkit directory.