uses python difflib without checking it exists
this ubuntu chroot has python 2.7 minimal installed:
checking for a Python interpreter with version >= 2.6... python
checking for python... /usr/bin/python
checking for python version... 2.7
checking for python platform... linux2
checking for python script directory... ${prefix}/lib/python2.7/site-packages
checking for python extension module directory... ${exec_prefix}/lib/python2.7/site-packages...
28 tests ok. (0 skipped)
PASS: unittests
Traceback (most recent call last):
File "./tester.py", line 12, in <module>
import difflib
ImportError: No module named difflib
FAIL: tester.py
===================
1 of 2 tests failed
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