Can't run an example out of the box #17

Steps:

git clone https://github.com/albertz/PyCParser.git
cd PyCParser
mkvirtualenv -p python2.7 -r ./requirements.txt pycparser
./runcprog.py ./demos/test_interpreter.c

Result:

EXCEPTION
Traceback (most recent call last):
File "./runcprog.py", line 56, in
line: from cparser import State, parse
locals:
cparser =
State =
parse =
File "/home/roba/work/github/PyCParser/cparser.py", line 14, in
line: from .cparser_utils import unicode, long, unichr
locals:
from =
from.cparser_utils =
unicode = <type 'unicode'>
long = <type 'long'>
unichr =
ValueError: Attempted relative import in non-package

Is there something to do before trying to use the runcprog.py script ?