Cannot install scrapy on my Mac using easy_install or pip - macos

Question

I am using sudo easy_install Scrapy to try and install Scrapy on my Mac (running Mac OS 10.9.2).
The installation appears to be nearly complete when I receive the error below. I can't seem to figure it out. Can anyone help?
Installed /Library/Python/2.7/site-packages/cssselect-0.9.1-py2.7.egg
Searching for lxml
Reading http://pypi.python.org/simple/lxml/
Best match: lxml 3.3.3
Downloading https://pypi.python.org/packages/source/l/lxml/lxml-3.3.3.tar.gz#md5=f2675837b4358a5ecab5fd9a783fd0e5
Processing lxml-3.3.3.tar.gz
Running lxml-3.3.3/setup.py -q bdist_egg --dist-dir /tmp/easy_install-xwN2PB/lxml-3.3.3/egg-dist-tmp-CkAsXC
Building lxml version 3.3.3.
Building without Cython.
Using build configuration of libxslt 1.1.28
/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'bugtrack_url'
warnings.warn(msg)
clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
error: Setup script exited with error: command 'cc' failed with exit status 1
Edit
Using pip install scrapy, I get the error below. So neither option works.
Installing collected packages: w3lib, queuelib, lxml
Running setup.py install for w3lib
error: could not create '/Library/Python/2.7/site-packages/w3lib': Permission denied
Complete output from command /usr/bin/python -c "import setuptools, tokenize;__file__='/private/var/folders/86/1mln902j0jx7698nxqk69_7r0000gn/T/pip_build_zacharygallinger/w3lib/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/86/1mln902j0jx7698nxqk69_7r0000gn/T/pip-hXKj0S-record/install-record.txt --single-version-externally-managed --compile:
running install
running build
running build_py
creating build
creating build/lib
creating build/lib/w3lib
copying w3lib/__init__.py -> build/lib/w3lib
copying w3lib/encoding.py -> build/lib/w3lib
copying w3lib/form.py -> build/lib/w3lib
copying w3lib/html.py -> build/lib/w3lib
copying w3lib/http.py -> build/lib/w3lib
copying w3lib/url.py -> build/lib/w3lib
copying w3lib/util.py -> build/lib/w3lib
running install_lib
creating /Library/Python/2.7/site-packages/w3lib
error: could not create '/Library/Python/2.7/site-packages/w3lib': Permission denied
----------------------------------------
Cleaning up...
Command /usr/bin/python -c "import setuptools, tokenize;__file__='/private/var/folders/86/1mln902j0jx7698nxqk69_7r0000gn/T/pip_build_zacharygallinger/w3lib/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/86/1mln902j0jx7698nxqk69_7r0000gn/T/pip-hXKj0S-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /private/var/folders/86/1mln902j0jx7698nxqk69_7r0000gn/T/pip_build_zacharygallinger/w3lib
Storing debug log for failure in /Users/zacharygallinger/Library/Logs/pip.log

Answer 1

For the time being you might be able to get past this by doing the following before building it:
export CFLAGS=-Qunused-arguments
export CPPFLAGS=-Qunused-arguments
This should signal the compiler to turn these errors back into warnings. Eventually, as indicated by the error message these will be hard errors. Long term, the package maintainer will have to edit the package to not use -mno-fused-madd.
For reference: https://bitbucket.org/cffi/cffi/issue/46/unused-mno-fused-madd-clang-warnings-on-os