[igraph] Installing igraph for Python 2.7 on Mac (without conda)

[Alexandre Attia]

Hello all,
I know there are already some questions about this topic but following the 
instructions didn't solve my issue.  
I am trying to install igraph for Python 2.7 in a virtual environment on Mac 
(without conda).  
I have tried to install it using homebrew (brew install cairo, brew install 
py2cairo, brew install igraph) and from the source code (with these 
instructions https://gist.github.com/Niknafs/6b50d9df9d5396a2e92e) but I still 
have the same error :  
```
ImportError: 
dlopen(/Users/alexandreattia/Desktop/Work/py27_venv/lib/python2.7/site-packages/igraph/_igraph.so,
 2): Symbol not found: _iconv
  Referenced from: 
/Users/alexandreattia/Desktop/Work/py27_venv/lib/python2.7/site-packages/igraph/_igraph.so
  Expected in: flat namespace
 in 
/Users/alexandreattia/Desktop/Work/py27_venv/lib/python2.7/site-packages/igraph/_igraph.so
```
I don’t know at all how to fix it.
Thank you very much for any help.

Best,