Install library from Adafruit
git clone https://github.com/adafruit/Adafruit_Python_CharLCD.git
cd ./Adafruit_Python_CharLCD
sudo python setup.py install
sudo apt-get install build-essential python-dev scons swig
Lots of stuff running across the screen, but it ends with:
Finished processing dependencies for Adafruit-CharLCD==1.1.1
sudo apt-get install rpi