[diffoscope] error at startup

[Mihai - Catalin Stefan]

Hi,

I'm trying to use diffoscope on Ubuntu 14.04.04 headless, installed via
pip, and I have the following error:
$ diffoscope
Traceback (most recent call last):
  File "/usr/local/bin/diffoscope", line 9, in <module>
    load_entry_point('diffoscope==61', 'console_scripts', 'diffoscope')()
  File "/usr/lib/python3/dist-packages/pkg_resources.py", line 351, in
load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2363, in
load_entry_point
    return ep.load()
  File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2088, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "/usr/local/lib/python3.4/dist-packages/diffoscope/main.py", line
31, in <module>
    import diffoscope.comparators
  File
"/usr/local/lib/python3.4/dist-packages/diffoscope/comparators/__init__.py",
line 193, in <module>
    FILE_CLASSES = import_comparators(COMPARATORS)
  File
"/usr/local/lib/python3.4/dist-packages/diffoscope/comparators/__init__.py",
line 99, in import_comparators
    'diffoscope.comparators.{}'.format(package)
  File "/usr/lib/python3.4/importlib/__init__.py", line 109, in
import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File
"/usr/local/lib/python3.4/dist-packages/diffoscope/comparators/deb.py",
line 24, in <module>
    from diffoscope.comparators.tar import TarContainer
  File
"/usr/local/lib/python3.4/dist-packages/diffoscope/comparators/tar.py",
line 24, in <module>
    from diffoscope.comparators.libarchive import LibarchiveContainer, \
  File
"/usr/local/lib/python3.4/dist-packages/diffoscope/comparators/libarchive.py",
line 24, in <module>
    import libarchive
  File "/usr/local/lib/python3.4/dist-packages/libarchive/__init__.py",
line 1, in <module>
    from .entry import ArchiveEntry
  File "/usr/local/lib/python3.4/dist-packages/libarchive/entry.py", line
6, in <module>
    from . import ffi
  File "/usr/local/lib/python3.4/dist-packages/libarchive/ffi.py", line 97,
in <module>
    errno = ffi('errno', [c_archive_p], c_int)
  File "/usr/local/lib/python3.4/dist-packages/libarchive/ffi.py", line 84,
in ffi
    f = getattr(libarchive, 'archive_'+name)
  File "/usr/lib/python3.4/ctypes/__init__.py", line 364, in __getattr__
    func = self.__getitem__(name)
  File "/usr/lib/python3.4/ctypes/__init__.py", line 369, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: /usr/bin/python3: undefined symbol: archive_errno

On a Ubuntu 14.04.5 non-headless diffoscope is working without problems.

Do I need to install some other packages or diffoscope isn't supported,
yet, on a headless machine ?

Thank you and best regards,
Mihai Stefan
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