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# create the virtualenv and work on it
mkvirtualenv graphite 
workon graphite
cd $VIRTUAL_ENV # we are now in /home/envs/graphite/ . If you are not, you may have a problem with your virtualenv

# apparently you have to make a symlink because cairo does not work with python 2.7 and pip
# my cairo module was located on /usr/lib/pymodules/python2.7/cairo Check this path, it may change on your server.
# You can execute `locate cairo` to find out.
# if this step does not work, you will not have any graphics in graphite later
ln -s /usr/lib/pymodules/python2.7/cairo ./lib/python2.7/