ffc doesn't build with python 2.6

[Former user]

Seems ffc 1.4.0 can't be builded with python 2.6: - setup.py, line 61 : check_output was introduced in python2.7

BTW i temporarily solved adding a def as suggested at this link: https://gist.github.com/edufelipe/1027906

and modifing setup.py file.

[Martin Sandve Alnæs]

FEniCS officially depends on python 2.7, python 2.6 hasn't received security updates for a year.

[Prof Garth Wells]

Is it easy to add a version check at installation?

[Martin Sandve Alnæs]

Something like this should do:

if sys.version_info[0] == 2 and sys.version_info[1] < 7:
    raise error