system_libs:WARNING: retrieving port: icu from https://github.com/unicode-org/icu/archive/release-62-1.zip
cache:DEBUG: PID 6146 released multiprocess file lock to Emscripten cache at /home/slawomir/.emscripten_cache/wasm-obj
Traceback (most recent call last):
  File "/home/slawomir/Programowanie/emsdk-nowsze/upstream/emscripten/emcc.py", line 3547, in <module>
    sys.exit(run(sys.argv))
  File "/home/slawomir/Programowanie/emsdk-nowsze/upstream/emscripten/emcc.py", line 1842, in run
    compile_source_file(i, input_file)
  File "/home/slawomir/Programowanie/emsdk-nowsze/upstream/emscripten/emcc.py", line 1824, in compile_source_file
    cmd = get_clang_command([input_file]) + ['-c', '-o', output_file]
  File "/home/slawomir/Programowanie/emsdk-nowsze/upstream/emscripten/emcc.py", line 1805, in get_clang_command
    args = system_libs.process_args(args, shared.Settings)
  File "/home/slawomir/Programowanie/emsdk-nowsze/upstream/emscripten/tools/system_libs.py", line 1570, in process_args
    args = port.process_args(Ports, args, settings, shared)
  File "/home/slawomir/Programowanie/emsdk-nowsze/upstream/emscripten/tools/ports/icu.py", line 43, in process_args
    get(ports, settings, shared)
  File "/home/slawomir/Programowanie/emsdk-nowsze/upstream/emscripten/tools/ports/icu.py", line 18, in get
    ports.fetch_project('icu', 'https://github.com/unicode-org/icu/archive/' + TAG + '.zip', 'icu-' + TAG, sha512hash=HASH)
  File "/home/slawomir/Programowanie/emsdk-nowsze/upstream/emscripten/tools/system_libs.py", line 1489, in fetch_project
    retrieve()
  File "/home/slawomir/Programowanie/emsdk-nowsze/upstream/emscripten/tools/system_libs.py", line 1437, in retrieve
    f = urlopen(url)
  File "/usr/lib64/python2.7/urllib2.py", line 154, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib64/python2.7/urllib2.py", line 429, in open
    response = self._open(req, data)
  File "/usr/lib64/python2.7/urllib2.py", line 452, in _open
    'unknown_open', req)
  File "/usr/lib64/python2.7/urllib2.py", line 407, in _call_chain
    result = func(*args)
  File "/usr/lib64/python2.7/urllib2.py", line 1266, in unknown_open
    raise URLError('unknown url type: %s' % type)
urllib2.URLError: <urlopen error unknown url type: https>