Virtual env install error

[swindlesmccoop]

When I try to run
pip install 'git+git://github.com/marcan/blitzloop.git'
I run into the following error:
ERROR: Command errored out with exit status 128: git clone -q git://github.com/marcan/blitzloop.git /tmp/pip-req-build-pj4ha8c0 Check the logs for full command output.
I'm not sure why it would give error 128, as (I think) that code corresponds to a command not found sort of error.