In Docs install graphite-web with pip
there has one pip install graphite-web, but unfortunate,this pip version is old,need install libcairo2-dev which is too diffcult to install.I check reqirements.txt and django code, find that i need to change the code graphite-web / webapp / graphite / render / glyph.py, and the code on master is already fix this.

try:
    import cairo
except ImportError:
    import cairocffi as cairo