Hi, This is a response to http://mail.scipy.org/pipermail/numpy-discussion/2011-April/055908.html A cleaner workaround that doesn't mess with your system Python (see https://github.com/pypa/virtualenv/issues/118) Activate the virtualenv mkdir $VIRTUAL_ENV/local ln -s $VIRTUAL_ENV/lib $VIRTUAL_ENV/local/lib Install Numpy Cheers, Scott