title: Spyder startup trouble
body: <p>I have troubles to start Spyder.
  This is the error message:</p>
  
  <pre><code>Traceback (most recent call last):
  File "/Applications/anaconda3/bin/spyder", line 7, in 
  from spyder.app.start import main
  File "/Applications/anaconda3/lib/python3.6/site-packages/spyder/app/start.py", line 27, in 
  from spyder.config.main import CONF
  File "/Applications/anaconda3/lib/python3.6/site-packages/spyder/config/main.py", line 22, in 
  from spyder.config.user import UserConfig
  File "/Applications/anaconda3/lib/python3.6/site-packages/spyder/config/user.py", line 26, in 
  from spyder.utils.programs import check_version
  File "/Applications/anaconda3/lib/python3.6/site-packages/spyder/utils/programs.py", line 18, in 
  import subprocess
  File "/Applications/anaconda3/lib/python3.6/subprocess.py", line 136, in 
  import _posixsubprocess
  ImportError: dlopen(/Applications/anaconda3/lib/python3.6/lib-dynload/_posixsubprocess.cpython-36m-darwin.so, 2): Symbol not found: __Py_set_inheritable_async_safe
  Referenced from: /Applications/anaconda3/lib/python3.6/lib-dynload/_posixsubprocess.cpython-36m-darwin.so
  Expected in: flat namespace
  in /Applications/anaconda3/lib/python3.6/lib-dynload/_posixsubprocess.cpython-36m-darwin.so
  </code></pre>
  
  <p>Somebody have an idea of what's going on?</p>