Can't install pillow under virtualenv on Ubuntu 14

Question

I am using virtualenv. When I run pip install pillow under it I get following:

OSError: [Errno 1] Operation not permitted:
'/windows/code/linux/cups/lib/python2.7/site-packages/PIL/GimpGradientFile.py'

When I use sudo pip install pillow I get it installed globally, and pip freeze under virtualenv don't display it (global does)

How can I install pillow under virtualenv?

Solved:

Used sudo -i to get root, then activated virtualenv, and pip install pillow worked correctly.

Answer 1

try as su, no sudo.

su

enter to you virtualenv and:

pip install pillow