无法在OS X El Capitan v10.11.4上安装scrapy for Python 2.7

Question

OS X El Capitan v10.11.4
Last login: Sat Apr  9 02:10:00 on ttys000
Fanng-Mac-mini:~ Fanng$ sudo pip install six
The directory '/Users/Fanng/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled.Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/Users/Fanng/Library/Caches/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Requirement already satisfied (use --upgrade to upgrade): six in /usr/local/lib/python2.7/site-packages