clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
I get the following error trying to install Scrapy in a Mavericks OS. I have command line tools and X11 installed I don't really know whats going on and I haven`t found the same error browsing through the Web. I think it might be related to some change in Xcode 5.1 Thanks for the answers! this is part of the command output: $pip install scrapy . . . . Downloading/unpacking cryptography>=0.2.1 (from pyOpenSSL->scrapy) Downloading cryptography-0.3.tar.gz (208kB): 208kB downloaded Running setup.py egg_info for package cryptography OS/X: confusion between 'cc' versus 'gcc' (see issue 123) will not