gss 4 安装PIL

###第一步

sudo apt-get install python-dev
sudo apt-get install libjpeg-dev
sudo apt-get install libjpeg8-dev
sudo apt-get install libpng3 
sudo apt-get install libfreetype6-dev

###第二步

cd usr/include/
ln -s freetype2 freetype

###第三步

workon rango
pip install PIL  --allow-unverified PIL --allow-all-external