Edit: FIXED!
Just had to chown the .cache directory
I\'ve tried the virtualenvwrapper docs instructions, I\'ve tried this guy\'s instructions as well as these...
I think that if you do that pip install numpy --no-cache-dir it will work.
pip install numpy --no-cache-dir
If you run pip --help you will find:
pip --help
--no-cache-dir Disable the cache.
Hope that it can help to someone in the future.