Install PIL on Ubuntu

Sometimes it's hard to install PIL on ubuntu, here are the tips to help fixing the install issue:

Install the build dependencies
sudo apt-get build-dep python-imaging

Symlink the libraries:

sudo ln -s /usr/lib/uname -i-linux-gnu/libfreetype.so /usr/lib/
sudo ln -s /usr/lib/uname -i-linux-gnu/libjpeg.so /usr/lib/
sudo ln -s /usr/lib/uname -i-linux-gnu/libz.so /usr/lib/

Install PIL:
pip install PIL

Done.