title: Unable to install pyicu on MacOS
body: <p>I tried installing through <code>pip3 install pyicu</code> and got following error:</p>
  
  <pre><code>Collecting pyicu
  Using cached https://files.pythonhosted.org/packages/bb/ef/3a7fcbba81bfd213e479131ae21445a2ddd14b46d70ef0109640b580bc5d/PyICU-2.0.3.tar.gz
  
  Complete output from command python setup.py egg_info:
  
  Building PyICU 2.0.3 for ICU 61
  
  Could not configure CXXFLAGS with icu-config
  Traceback (most recent call last):
    File "&lt;string&gt;", line 1, in &lt;module&gt;
    File "/private/var/folders/80/v1nwf70x2rz5srmzfnpc3pq40000gn/T/pip-build-b_sify1x/pyicu/setup.py", line 131, in &lt;module&gt;
      _cflags, ('--cxxflags', '--cppflags'), 'CXXFLAGS')
    File "/private/var/folders/80/v1nwf70x2rz5srmzfnpc3pq40000gn/T/pip-build-b_sify1x/pyicu/setup.py", line 30, in configure_with_icu_config
      output = check_output(('icu-config',) + config_args).strip()
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 336, in check_output
      **kwargs).stdout
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 403, in run
      with Popen(*popenargs, **kwargs) as process:
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 707, in __init__
      restore_signals, start_new_session)
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 1326, in _execute_child
      raise child_exception_type(errno_num, err_msg)
  FileNotFoundError: [Errno 2] No such file or directory: 'icu-config'
  
  ----------------------------------------
  Command "python setup.py egg_info" failed with error code 1 in /private/var/folders/80/v1nwf70x2rz5srmzfnpc3pq40000gn/T/pip-build-b_sify1x/pyicu/
  </code></pre>
  
  <p>Then from some source I got to know that I need to install <code>icu4c</code> and configure by <code>.bash_profile</code> for icu. Also tried doing that but error persists. Please help me out.</p>