urllib2 error when installing

[alexreg]

I'm following the instructions in the README to install Cargo.

git clone https://github.com/rust-lang/cargo
cd cargo
git submodule update --init
./.travis.install.deps.sh
./configure --local-rust-root="$PWD"/rustc
make
make install

But on the make step, it immediately fails with the following Python error. https://gist.github.com/e1859a1b726646296c2a. (Note that I'm running on OS X 10.10.2 with Python 2.7.9.)

See mtschirs/quizduellapi#2 (comment) for possible cause.

It seems that Python < 2.7.9 didn't validate certificates in the HTTP client.