1. Install the dependencies needed for the PIL library, using aptitude. This installs everything but PIL itself.
sudo apt-get build-dep python-imaging
2. Install the python-dev package so that we can compile PIL.
sudo apt-get install python-dev
3. Make sure that PIL’s setup.py can find JPEG/ZLIB, by creating find-able links to the libraries. Ubuntu installs these libs in a non-standard place, so the package installer needs a little help finding them.
sudo ln -s /usr/lib/x86_64-linux-gnu/libfreetype.so /usr/lib/
sudo ln -s /usr/lib/x86_64-linux-gnu/libz.so /usr/lib/
sudo ln -s /usr/lib/x86_64-linux-gnu/libjpeg.so /usr/lib/
*note* These links are for a 64-bit Ubuntu. For 32-bit installations, I believe it should be replaced by i386-linux-gnu
4. From the root of your virtualenv (with it activated) run:
pip install PIL