GCC-4.2 error on Mac OS-X Mountain Lion, unable to install some packages with pip / virtualenv

Question

I\'m seeing a very annoying bug that I don\'t really know how to deal with. It seems to be pretty common, and I\'ve tried nearly every solution that I could find to no avail.

Answer 1

Setting this environmental variable did it for me, without the need to mess around with Xcode or it's downloads.

ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future