[AstroPy] package requirements for pyregion

[Vicky Scowcroft]

Hi,
I'm following the setup instructions at
http://python4astronomers.github.com/installation/python_install.html

Under "MacOS or root linux install" you have:

sudo pip install --upgrade pyregion


This doesn't work without the pyrex package,
so

sudo pip install --upgrade pyrex

should be added before.

Thanks
Vicky
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