Tried doing a new python-igraph install on a new computer with clean anaconda 2.7.3 install. Got:
Extracting igraph-0.7.1.tar.gz...
Configuring igraph...
Could not download and compile the C core of igraph.
----------------------------------------
Command "/Users/Nick/anaconda/bin/python -c "import setuptools, tokenize;__file__='/private/var/folders/cc/pft59bnd1p96k2hrf6zz_63w0000gn/T/pip-build-5w2_4W/python-igraph/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/cc/pft59bnd1p96k2hrf6zz_63w0000gn/T/pip-OlmN2f-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/var/folders/cc/pft59bnd1p96k2hrf6zz_63w0000gn/T/pip-build-5w2_4W/python-igraph
Full output attached.