If you don't use Homebrew and don't want to install it, but you have a working C compiler on your machine (e.g., from XCode), you can try the following procedure:
1. Download igraph's source code and extract it
2. Run "./configure && make && sudo make install". It will ask for your password in the installation step.
3. Try "pip install python-igraph" -- hopefully it will work. If it doesn't, drop me an email and I'll help.
Thanks Tamas. I think I will go for this approach. But after I decompress the source, there is no 'configure' file within the directory. Below is the folder structure I am seeing:
COPYING debian scripts src
MANIFEST.in igraph setup.cfg test
PKG-INFO python_igraph.egg-info setup.py
Maybe I am missing something?